A/N: Before we begin, know that some of the backstories for some monsters will be altered slightly later on. Now, story.


Everyone in the meeting room were getting back to their feet after what felt like a massive explosion both knocked the power out and everyone out of their chairs.

"EMERGENCY POWER ONLINE!" a robotic voice announced just before the power came back.

"What in blazes was that?! What's going on out there?!" Sitch demanded.

"I don't know! All communications have been cut off! We're in the dark, sir!" the Bearded Worker answered as he tried to reach anyone with his phone. Sitch frantically began to type some commands before a few holo-screens came up, showing him a horrible scene.

"Th-This can't be happening!" he muttered in disbelieving shock.


An injured boy was lying in a tiny space under a pile of rubble. He didn't know what had happened, but was scared out of his mind. He jerked his eyes up when he heard the rubble above him being moved, revealing an older man.

"Dad!" the boy cried.

"We're okay, son! Grab onto me!" his father ordered. The boy complied and was brought out of the hole and into a tight hug while crying. He stopped and looked around to see that City-A had now been reduced to nothing but ruins.

"What's this?"

Both father and child turned to see the strange creature with five heads standing before them.

"It appears there are survivors."

"The ship failed to kill them."

"We won't!"

"That is good."

The father held his son close as the creature lifted a hand towards them, it's fingers extending right at them-

SL-SLASH

The monster grunted at both the loss of it's fingers and the slash across it's torso, courtesy of the man in armor who had just sheated his blade.

"Get away from here, right now!" Class-A hero Iaian ordered. He smiled as the father and son ran for safety before tensing up, the monster looming over him from behind. It smashed it's hands together before dropping the squished helmet the hero wore.

"You think I don't sense your thirst for blood?" Iaian growled from behind the monster. "I accompanied Master Atomic here and was waiting for the Class-S meeting end, only to meet thunder and destruction." He then took a stance and lunged at the being. "IS THIS YOUR DOING, BEAST?!" he roared before cleaving the monster practically in half.


"D-Destruction levels are at 99.8 percent! City-A has been leveled! It was completely wiped off the map! I THOUGHT WE HAD MORE TIME! HOW COULD WE HAVE KNOWN HER PREDICTION WOULD COME SO SOON?!" Sitch yelled in hysterical panic.

"Hold on! Why was this building spared?!" Bang asked.

"Metal Knight was assigned to construct this building. His cutting-edge specs are why it's stronger than the average shelter." explained the Bespectacled Worker.

"Oh, so that's why there are no windows." Metal Bat pointed out.

"Hmm? Where'd Saitama go?" Tank-Top Master asked, earning a few looks from the others.

"You mean that Class-B weirdo? He's..." Tatsumaki began before she and a few others noticed the hole in the ceiling.

"It seems Master Saitama has already gone ahead." Genos answered.

"Master Saitama?" Atomic Samurai asked, an eyebrow raised in confusion.

"Let us discuss this later." Bang interrupted. "We have work to do."

-On the roof-

Saitama was staring up at the massive ship hovering above what was once City-A.

"That's big! Are they aliens?" he asked to himself before jumping up towards the ship. He blinked when he saw a light appear from the ship before suddenly shifting himself mid-air, allowing him to watch as the massive shell whizzed by mere inches from his face. "So that's what blew the city to pieces." he muttered before noticing more shells heading his way. He dodged a few more before jumping off another and stopping the last one with his foot, causing it to smash and warp around it. "I've had enough! GET LOST!" he shouted as he kicked the shell back at the ship.


Iaian was panting hard from fighting the monster, which was going nowhere fast. Every time he would slash the monster, it's wounds would mend no matter how deep they were.

"This is one militant creature."

"Also cautious."

"Hurry. Let us hurry and kill."

"That is good." the last one was followed by all five heads smiling.

'Can it even be destroyed?' the hero thought in frustration before swiftly dodging a fatal strike. Sadly, he didn't get out unscathed and was now missing his left arm. 'Each of it's strikes is lethal! I can't beat this thing!' He grabbed his bloody stump while the alien's body began to grow, a face following each part.

"Such a weak and frail species."

"So easily killed."

"That is good."

Iaian could only stand there in shock and dread as it split into five, wondering just what exactly this thing was.

"I will dispose of this one. You handle the others."

"Very well then."

"I will go kill those that ran away from us."

"That is good."

"I-"

SLAAAASH!

Iaian gaped as a bright flash seemed to cut the five aliens to pieces, their bodies crumbling all around at the feet of the one who had attacked.

"Master!" Iaian shouted in shock.

"Iai, you don't look so good." Atomic Samurai said, his blade blade in hand. "You okay? Your left arm's kind of-"

"MASTER! SWORDS HAVE NO EFFECT ON THIS STRANGE CREATURE! FORGET ABOUT ME! RUN!" Iaian begged before the alien formed up and attempted to attack the Class-S hero.

"BEGONE!" roared Atomic Samurai as he sliced it to pieces once again before turning to Iaian. "Iai! The path of the sword does not end for you here! Stop bleeding!" he ordered.

"Yes Master!" responded his disciple before he and AS turned to see the monster had pulled itself together again, only this time the five heads merged into a singular one with five pairs of eyes and rows of teeth.

"Hehehe! Good! Seems a lifeform on this planet can fight! Excellent! I invite you to try and withstand our invasion!" it said with a massive grin.

"'Planet', huh? So you're from outer space? And you got more friends up there on that floaty toy ship?" Atomic Samurai asked with a smirk, earning a grunt from the alien. "Yeah, that's what I thought." he said before readying himself to fight. "I doubt you have the strength to do this much damage to the city by yourself."

"You can count us in, Atomic Samurai." Bang said as he and Metal Bat flanked the swordsman.

"You the ugly bastard that wrecked this city?" Metal Bat asked despite knowing the answer.

"And what if I am?" the alien asked.

"For all the beautiful men you killed!"

The alien turned to see Puri-Puri Prisoner running towards him before leaping into the air.

"I CLAIM VENGEANCE!" he declared before his prison garb ripped from his body and wings appeared on his back.

These wings, however, were black.

'Like she said.' he thought, his mind going back to his fight with the Deep Sea Queen. 'Each separate attack must with intent! TO KILL!'

"DARK ANGEL RUSH!" he roared as he began to pepper the alien with powerful punches.


The Bearded and Bespectacled Workers ran through the halls of the Hero Association HQ until they arrived at a room full of other colleagues frantically working at their stations.

"Issue an evacuation warning for City-A and all neighboring cities, right away!" BW ordered, earning a 'Yes sir!' from everyone in the room. "And expand the System M Vitals Monitor to cover all of City-A! We'll need an accurate count of the survivors we'll need to rescue!"

"What's the threat level?" one of them asked.

"Dragon, without a doubt!" the Bespectacled Worker answered, much to the shock and horror of them all.

"...Not quite." Bearded Worker said in a grave tone as he looked up the ship being broadcasted on the monitors. "This may be 'God'."


"Four Class-S heroes can handle the enemy on the ground. But the real problem is up there. We can't reach that ship. Any aircraft would be shot down in a matter of seconds." Child Emperor stated. He, Genos, Tatsumaki, and Superalloy Darkshine were standing on the roof, with King hanging onto the edge of the hole that Saitama made when he jumped through the roof.

"Any ideas?" Darkshine asked King. "You're one of the top fighters of Class-S King, so I'd love to hear you take on this."

'King. Class-S Rank 7. Said to be the strongest man on earth. And I can see that he is well respected by the other heroes.' Genos thought as he and the others looked to King, his King Engine sounding out.

"...There's nothing I can do here." he finally said, confusing the others. "It's too high in the sky. There's no way to reach it. But the mysterious craft is currently stationary. We should use this opportunity to call in Metal Knight."

"Are you for real?! How utterly pathetic! Aren't you supposed to be the strongest man on earth?!" Tatsumaki snapped, causing Darkshine to try and calm her down before King killed her. "This city's been destroyed, people wiped off the planet, and all you want to do is give them a free hand?! Unbelievable!" King's only response was for the King Engine so speed up. "Well forget it! I'll just take care of these creeps myself!"

"Wait." Genos spoke up, gaining her attention. "I will go too. I do not know how effective I will be, but I will attack the enemy from the ground." he offered, his palms smoking and ready to act.

"MAYBE YOU DIDN'T HEAR ME! I SAID FORGET ABOUT IT, OKAY?!" the esper bellowed at him. Genos merely put his arms down and stared at her with a look that asked if she was for real.

"Whoa! Take it easy Genos! I know how you feel, but if you piss her off she will kill you!" Darkshine warned, trying to keep them from fighting each other.

'Very well. There is no need to team up with others anyway.' Genos thought as he looked back up at the ship. 'Master Saitama has already boarded the alien vessel. Whether this is the prophecy that Madame Shibabawa spoke of, there is not a single evil that could defeat master. If such an evil existed, then I am sure that the human race would've perished into oblivion long ago.'


The corridors of the alien ship were littered with wrecked technology and various corpses of different shapes, sizes, and species. And the body count continued to increase as Saitama ran through it's halls, defeating everything that tried to stop him.

"GAHAHA!" something cackled, causing Saitama to stop and stare up at another alien. It was a green muscular alien that had no eyes, what looked two heads in place of hands, and a fourth head on the end of a tail. "WELL DONE MAKE IT THIS FAR INTRUDER, BUT YOU HAVE REACHED THE END! I AM GRORIBAS, AND YOU SHALL NEVER DEFEAT!" He then lunged at the bald hero, ready to end his life. "MY ACID BREATH WILL MELT YOU INTO A PILE OF FLESHY PULP!"

WOOSH!

And he now joined his fellow aliens in the afterlife, his headless body bleeding on the ground, leaving Saitama to continue his rampage. A rampage that was being seen thanks to the many security cameras everywhere.

-Alien Ship, Main Control Room-

The control room was full of shocked aliens as they monitored Saitama as he ran through the ship destroying everything he could get his hands on. They soon began to fear for their lives when they saw him waste Groribas like he was nothing.

"Y-You gotta be kidding me!" exclaimed the largest one that was floating in the room.

It looked like a giant blue skinned woman with big yellow eyes. She had a bit of an hourglass figure, but was far bigger around the hips and butt than she was around her breasts.

"Even Groribas, our best warrior, was defeated?!" she said in shock as she watched Saitama appear on various cameras before they were destroyed with each attack he dealt. "What kind of creature is this thing? How'd he get on the ship in the first place?! Wasn't Melzargard supposed to be guarding the ship against any threats? Tch! Five heads, 10 eyes, and not a single brain cell anywhere!" She ran her hands down the sides of her face in panic as kept watching the crew get killed. "First the gunner's little helper gets trigger happy, now this?!"

"And what exactly is it that you are referring to, Geryuganshoop?"

The now named Geryuganshoop flailed about in a panic, revealing her arms and legs to be a vast amount of tiny tentacles wound together. She composed herself before turning to face the one who had spoken.

Standing before her was a one-eyed alien with light blue skin that had cracks running from her eye all over her feminine face and light pink spiky hair with long bangs.. She wore a set of golden armor with spikes on the shoulders and forearms with a red jewel in the middle and a cape, a matching set of golden boots, white puffy harem pants held up by a magenta-colored sash with silver-lined purple blades hanging from it, and silver earrings.

"L-Lady Boros!" Geryuganshoop said in fright and respect.

"Well?" Boros said, revealing her sharp teeth. "What's been happening while I've been...disciplining the one who fired before I gave the order?"

"I'm afraid a lot has happened. Forgive me, Lady Boros, but I've made a terrible mistake and allowed one of the natives to get on board the ship. In the mere four minutes since he got here, 23% of the ship has been damaged. It seems he's alone, but has instantly killed every soldier sent to intercept him. Even Groribas fell without a fight!"

"Is that so?" Boros asked in mild interest, wondering who could've easily killed the best fighter on the ship after her. She looked up to analyze the damage reports before turning back to Geryuganshoop. "It seems that the damage is mainly the crew's quarters. If this creature took out Groribas, then sending the lower crewmates would be a waste of time."

"I'll call Melzargard back. Together, we'll wipe out this intruder!" Geryuganshoop said in confidence before trying to reach Melzargard with her mind, leaving Boros to look up Saitama's image displayed on the monitors.


Puri-Puri Prisoner was panting after letting up on his attack, leaving Melzargard with many holes through his body.

'He pummeled that thing with nothing but the power of his bare fists!' Iaian thought in awe as he held the stump that used to be his left arm. 'That's a Class-S hero for you. Even so...'

All of them were on guard when Melzargard's wounds healed once again, leaving the alien without a scratch.

"THAT WON'T DO ANY GOOD! IT POSSESSES INCREDIBLE REGENERATIVE POWERS! AND BE SURE NOT TO LET ANY PART OF IT TOUCH YOU! A SINGLE BLOW INSTANTLY TORE MY ENTIRE ARM OFF!" Iaian warned. They all saw Melzargard raised a fist towards them. "DODGE IT'S ATTACKS AT ALL COST!" Iaian yelled before the fist flew towards Puri-Puri Prisoner.

"If I may?" Silverfang asked before moving between the two and deflecting the attack away. He then lunged and struck the alien with enough force to send it skidding across the ground away from them all.

"Ngh! Should we use a bombardment to deal with these creatures?" he asked before another head sprouted out of his forehead, a set of eyes disappearing from the many others.

"Yes, that is good." the smaller head replied.

"Contact the ship." Melzargard ordered.

"I will go." the head said with a smile as it sprouted wings and took off.

"GET BACK HERE!"

It didn't get very far before being smashed into the ground by Metal Bat.

"Scummy bat! BETTER MIND YOUR MANNERS!" roared the hero as he smashed it to mush. "I hope you like mincemeat, freak!"

"Melzargard! What are you doing?!" Geryuganshoop shouted to the alien via telepathy.

'I'm in battle.' he thought back as he rose to his feet and glared at the heroes.

"We have an intruder!" she yelled, shocking him.

'Impossible!'


"It's true! Hurry! Finish them off and get back up here immediately!" she ordered before looking at Saitama trying to open a door from on a monitor.

"Crap. This one's locked too. Hey! Open the door! You've got a visitor!" he called out before pulling the door, and the wall, off. "Whoops. Think I broke it."

"WILL YOU STOP BREAKING EVERYTHING?!" Geryuganshoop roared, making the bald hero look around in confusion.

"That was weird. I heard a voice in my head." Saitama said. "Well, whoever you are, I didn't mean to break it. It was locked."

"No it wasn't, you moron! It slides open! And who cares anyway?! GET OFF OUR SHIP!" she yelled before muttering to herself. "Stupid gunner's dumb little helper had to just shoot without orders." She shook her head when she heard something else crashed and looked when she saw that he had dropped the broken door and was now continuing his rampage. "HEY! QUIT IT!"


Metal Bat watched as the pieces of head began to float before reassembling itself.

"I know. I'll rip your limbs off and make you the ship mascot." it declared before sprouting wings again. "That is good."

"Tch." Metal Bat growled before spitting into his hands and tightening his grip on his weapon. "Put yourself back together again, huh?" he asked before he proceeded to smack the head around. "I'M GONNA KEEP YOU FOR BATTING PRACTICE!"

As the young hero continued to smack the floating head around, the other three Class-S heroes began to their assault on Melzargard. Silverfang and Puri-Puri Prisoner unleashed a barrage of lethal strikes while Atomic Samurai slashed at every angle of the alien.

"COMRADES! DIRECT PHYSICAL ATTACKS HAVE NO EFFECT ON THIS CREATURE! ALL OF OUR EFFORTS HAVE BEEN IN VAIN! LET'S WITHDRAW FOR NOW! THERE MUST BE SOMETHING ELSE WE CAN TRY, LIKE USING HEAT!" Iaian yelled, hoping to keep them from getting killed with their reckless attacking.

"SMASHING ALL I'M GOOD AT! FORGET IT!" Metal Bat yelled back.

"This is all I know how to do as well! Can't teach an old dog new tricks! My apologies!" Bang answered.

"That goes for me too! Sorry, sweet Iaian!" PPP said.

"Iai! I'm disappointed! Don't you have faith in me?! There's nothing I can't cut!" Atomic Samurai boasted.

'...It's pointless. These guys are used to coming out on top. They aren't the type to listen.' Iaian mentally lamented.

"MELZAGARD!" Geryuganshoop yelled as he pulled himself together. "Stop dawdling and get back up here! This creature's wrecking everything!"

'I'd love you, but I'm a little busy here.' he answered as he either dodged or blocked the heroes attacks. 'These creatures are persistent!'

"You've got to be kidding me! The creatures of this planet are proving tough too?! What is up with this place?!"

'Nothing tough about them. What's the ship's status? Is it going down or what?'

"It's not going down, but more than half the crew have been killed by this creature."

'There's no way!' Melzargard thought in disbelief as his body was peppered again with attacks. 'I need to finish this fast! Begin cleansing my the area with a bombardment!'

"I've got my hands full here trying to get this earthling to stop! Besides, artillery is the job of the lower ranks!" she said as she watched Saitama wander the halls on the monitors.

'Well I'm in a situation where I can't come back aboard!' Melzargard growled.

"Fine! I'll notify artillery of your predicament! But don't blame me if you get caught in the blast and die!" she huffed before cutting the mental link with him.

"Wait! Hold on a second!" Melzargard yelled up at the ship before his head was sliced off, letting the top half float in the air. 'You should come down here and help me! That'd be a much faster solution!...HEY! GERYUGANSHOOP!...That bitch cut the connection! Just how strong is this intruder?!' he thought before his head flew back.

"HOW ABOUT ANOTHER ONE?!" Metal Bat roared as he smashed the head into pieces again, a strange object floating amongst the debris.

"More attacks. Keep trying. It is good that you're exhausting yourself." the head somehow said without a mouth before it began to pull itself together.

"Huh?" Metal Bat grunted before rushing forward and grabbing something from inside the head during it' reconstruction. "The heck is this thing?" he asked. The head's only response was to stare at him in wide eyed shock. The hero opened his palm to reveal a tiny blue glass sphere. "A marble? Why d'you got one of these?"

"GIVE IT BACK!" the head demanded.

"Here you go!" Metal Bat said while tossing the marble up before smashing it with his bat.

"GRA-aagh..." the head grunted before it slowly fell to the ground and melted into goo.

"Whoa! That's nasty, ya nasty bastard! You dead?" Metal Bat asked before turning to the others. "HEY! I JUST DISCOVERED SOMETHING! THESE THINGS HAVE A MARBLE INSIDE THEM! DESTROY IT AND THEY DIE!"

Melzargard gasped in a mixture of anger and horror at the knowledge of one of his heads being destroyed.

"Is that so?" Atomic Samurai asked with a grin as he and other heroes prepared themselves to properly fight the alien creature. "So all I need to do is slice away at you unitl I find this vital marble he's talking about!" With that, he began a relentless attack, slashing everywhere to try and find the rest of Melzargard's marbles.

'Impossible! I've been growing that head for 100 years, and it got killed in this dump!' Melzargarb thought in rage as he was attacked. 'Either way, you scum are dead when the shells hit. They're coming, and there's no way for you to stop them!'


Geryuganshoop was growing steadily more frustrated as she watched Saitama continue to run rampant inside the ship, no matter how much she screamed at him to stop.

"FOR CRYING OUT LOUD! WHAT'S IT GONNA TAKE TO GET YOU OFF OUR SHIP?!" she yelled, willing to do just about anything to get him to leave.

"Well, some directions would help. I don't know which way the exit is." he answered as he stood at a three way intersection.

"Wait, really?! That's what'd get you to leave?" she asked with a hopeful smile. "Well then, I'll gladly guide you. Take a right, then go up the stairs. Wait there for further instructions."

"A right?"

"Yes. A right." she repeated. She could see Saitama staring up at the air for a moment before a big grin came to his face.

"I guess I'll go left then!" he chuckled before jogging down the left hall.

"WHAT?! NO! NOT THAT WAY! WAIT! STOP! DON'T!" she yelled as she watched him run down the hall. "Alright! My fault! Poor directions! I'll come to you! Just stay right there!" she begged. Sadly, her words fell on deaf ears as he continued towards the door at the end of the hall. "No. No! NONONONONO!"

CRASH!

The aliens all jumped to the feet when the door was smashed from Saitama running straight through it.

"Huh. Now this looks like a control room." Saitama said as he looked at all the monitors and control stations.

"YOU!"

The bald hero turned to see several blue tentacles appear from the lower area.

"An octopus?" he asked before seeing Geryuganshoop float into the air before him.

"YOU BREAK INTO OUR SHIP, BUST EVERYTHING IN SIGHT, AND KILL HALF THE CREW LIKE YOU OWN THE PLACE?!"

The floating debris before her suddenly sped at him, punching holes in the floor. If any of them hit him, they didn't do any good.

"What the...? The debris flying at me." Saitama pointed out.

"I, GERYUGANSHOOP, SUPREME TELEKINETIC POWER IN THE UNIVERSE, SHALL GRIND YOU INTO BLOOD SAUSAGE!"


"This is bad. This is very bad!" Tank-Top Tiger fretted as he and the rest of the TT Army watched the news about City-A's destruction.

"That ship blew City-A away! Like a giant...purple...floating bunch of blisters!" Tank-Top Black Hole got out.

"Blisters?" Tank-Top Mask asked with a raised eyebrow.

"SHUT UP!" Black-Hole retorted. "CITY-A IS BLOWN TO SHIT! I'M TRYING NOT TO PANIC HERE!"

"Sounds like you're doing a great job." TT Vegetarian sarcastically remarked.

That set them off as they began to scream at each other. Half of them trying to stop the panicking. The other half unintentionally stoking the flames of discord

Luckily, one of them wasn't a moron.

Bop!

Everyone stopped when something hit Tank-Top Vegetarian square in the nose. He looked down at the shoe before picking it up.

"One more word, and I throw the other one!" Tank-Top Girl warned, her remaining shoe in her hand ready to bean someone. "Yelling and screaming won't fix anything!"

"She's right." TT Hatter said after a moment of silence. "If Master were here, he'd have our tank-tops for behaving like children."

'Hatter's right. In times like these, we can't panic. We're heroes. We're supposed to be calm and handle situations like this.' TT Girl thought as she and the rest of them watched the news. 'And besides, Tank-Top Master and all of Class-S are in City-A right now fighting these aliens. There's no way they can lose. And if I know Genos, he'd have asked Saitama to come along as well.' Her fists clenched as a smile came to her face.

"Get 'em, everyone." she whispered to herself.


Everyone inside the apartment was silent as they watched the news of the alien invasion and City-A's destruction.

"City-A...gone." Ki muttered, her mind still in shock.

"It'd be a miracle if anyone survived." Kogane whispered while Nori just quietly cried.

"How could this happen? Where'd they come from?!" Fubuki gaped in horror.

"I don't know? Maybe the aliens came from space?" Newtina deadpanned at her before looking back at the TV.

"We have footage of what looks to be a group of monsters attacking the Hero Association Headquarters moments before the alien vessel appeared." the news reporter explained. They watched as the Sky King launched fireballs at the building, his children flying behind him before they were all suddenly struck down by Melzargard. The video ended just after a bright light came from the ship before artillery rained from the sky.

"The Sky King? Attacking the Headquarters of the Hero Association?" Deep Sea Queen commented in surprise from outside the doorway.

"You know him?" Vaccine Woman asked.

"Yes. He and his clan ruled the skies. My clan rule the seas, and the Subterranean Queen and her people ruled under the surface." she explained.

"What are you all doing here?! Move it!"

Those inside looked at the door to see a disguised Midori shove her way inside, panting and gasping for breath.

"Midori? What are you doing back here?" Vaccine Woman asked.

"I was...out for a walk...waiting for Master Bang and the others to come back." she answered before looking up at the TV. "On my way home, I saw what happened to City-A and ran back here."

"Wait. You mean Saitama is with Genos and Bang?" Nori asked.

"Yeah. Genos and Bang were called to an emergency Class-S meeting, and Genos asked if Saitama wanted to come along." Midori explained. "They're all in City-A."

"Wait. If Saitama is in City-A, then that means-" Ki began.

"Those alien fuckers are dead!" Newtina finished for Ki.

"Actually, he won't be needed." Fubuki said with a confident smile. "If all of Class-S was summoned, then that means my sister, Tornado, is there too. And that means she'll probably take care of it all on her own."

The rest of her group quickly began to voice their agreements. They may fear her and not like her with how she makes Fubuki feel, but they couldn't deny that Tornado was powerful.

The only response the monsters gave them was a look that asked if they were serious before those who were sitting inside began to whisper to each other.

"Are these morons still doubting Saitama's strength?" Midori whispered.

"I'm surprised that that Fubuki woman would say that, considering Saitama saved her life." Nori added.

"Can't be helped. Saitama isn't that well known. Just gotta give them time to realize how powerful he is." Kogane suggested while Newtina got to her feet.

"Well, I don't know about the rest of you guys, but I'm gonna take a walk. Shout when Saitama brings the ship down." she said before walking past them all.

"Me too. I don't like all this violence." Nori grumbled before following Newtina.

"I'm gonna go tend to the garden." Vaccine Woman stated before leaving as well.

The rest of the monsters were silent as they and the Blizzard Group returned their attention to the news.


Mizuki was having a very bad day. She and the other heroes inside the city were faced with a crisis that some found to be even worse than a monster attack.

That crisis? Scared, hysterical citizens.

With news of City-A's destruction at the hands of an unknown vessel spreading like wildfire, many of the citizens reactions were far from calm. Some cowered in fear. Others wondered what the heroes were doing. Some even suddenly found religion. And some...

"RUN FOR YOU LIVES!

"IT'S THE END OF THE WORLD!"

"I CAN'T DIE YET! I'M STILL A VIRGIN!"

Simply lost their shit.

"Everyone! Please calm down!" Mizuki yelled in an attempt to quell the panicking crowds. She and the other heroes were trying to stop them all and regain order of the situation while also doing their best to stop the sudden rash of crime in the area. "HEY!" she suddenly yelled at some young punks looting a liquor store. "PUT THAT DOWN!"

"Captain Mizuki!"

The hero turned to see a group of men coming towards her, all waving flags and wearing shirts with crudely drawn images of her on them.

"Uh oh. Uh, I mean, yes?!" she asked, knowing who they were, yet not what they wanted.

"We of the 'Captain Mizuki Muscle Worship Group' request your immediate help!" the man in front stated, obviously the leader.

"Help with what? Is it a monster?!" she questioned before noticing the strange looks they were giving her.

"The end of the world is upon us." the leader continued, his breathing a little funny. "And seeing no tomorrow for any of us, we have...we have decided..."

"Have decided?" Mizuki parroted.

"THAT WE'RE NOT GONNA WAIT FOR YOU TO NOTICE US ANYMORE!" he suddenly yelled before he and the other men all rushed towards her, their hands out and grabbing at the air. "LET US FEEL THOSE WONDERFUL MUSCLES, CAPTAIN MIZUKI!"

KAPOW!

"HAVE YOU ALL LOST YOUR MINDS?!" she roared as she sent them all flying with a swing of her extended baton. She watched them all land in a heap a good ten yards away, her face blushing from both anger and embarrassment. "ALIENS ATTACK, A CITY GETS BLOWN TO PIECES, AND YOU GUYS REACT BY COMING TO ME TO COP A FEEL?! WHAT IS WRONG WITH YOU?!"

As she glared at their groaning forms, a thought came to mind.

'I wonder if Saitama will ever have fans like them one day. And if so, what would he do in a situation like this?'

-Monster Association-

Gyoro Gyoro was silently observing the smoking ruins that was once City-A through a drone, marveling at the destruction caused by the alien ship.

"Incredible! A whole city wiped out in the blink of an eye!" he exclaimed with joy before looking at the Hero Association HQ. "Shame that the Hero Association's main building is still standing. Would've saved us a lot of trouble in the future." His main body in the Monster Association relaxed as he listened to the collective roar of approval from the rest of the Monster Association. "Well, at least they're now more motivated than ever to fight. Shame I have to keep them on a leash for now, otherwise their overconfidence will have them rushing to their deaths."

As they went back to watching what was happening in City-A, the monsters everywhere were celebrating like there was no tomorrow.

"HOORAY FOR THE ALIENS!"

"THEY WIPED OUT A WHOLE CITY OF WORTHLESS HUMANS!"

"TAKE OUT THE HERO ASSOCIATION TOO, OKAY?! HAHAHA"

These and so much more filled the halls of the Monster Association, with every monster glad that City-A was gone.

...Well, almost every monster.

Maiko Plasma was quiet as the others cheered before walking off, gaining the attention of Electric Catfish Man.

"Hey. Something up?" he asked her. "Why aren't you celebrating? A whole city's gone!"

"I know. I heard." she responded.

"Then what's got you down?" he wondered before a thought came to mind. "Oooh, I get it. You're still shaken up from that one guy that smashed Vacuuma. Is that it?"

"...maybe." she muttered loud enough for him to hear.

"If you're scared of running into him again, then don't be. So what if he beat Vacuuma? Don't forget that he had been fighting two Class-S heroes and a whole bunch of others before he jumped in. Probably got lucky and dealt the final blow is all."

"Maybe." she repeated before walking on, leaving the other electric monster to himself.

"Meh. When we thrash the Hero Association and kill all the heroes, she'll turn around." he said as he rejoined the celebration.

'Lucky hit? If you only knew.' MP thought as she wandered the halls of the Monster Association. 'They have no idea of how powerful this guy is. Vacuuma could've absorbed all the other monsters and heroes up their at the time, and still would've lost!'

"Not celebrating?"

She was knocked out of her thoughts at another voice. She looked to see Do-S leaning against the wall, her gaze locked onto Maiko Plasma.

"Not really, no. You?"

"It's not that I don't want to. It's more like..." Maiko Plasma trailed off, unable to explain what she was feeling.

"Like you can't seem to get happy at the thought of all those humans dead?" Do-S questioned before sighing. "Well, you're not alone."

"Wait, what? You mean...?" she said as she stared at Do-S

"Don't get me wrong. Even before I become a monster, I was always a sadistic person, even as a little girl." Do-S explained, a grin forming under her mask. "It was absolute ecstasy to make others cry in pain and fear. But there was always the fact that I knew that there was only so pain you could inflict on them before it crossed the line. Only after turning into a monster did I stop caring about that and tortured to my hearts content, making them my love slaves or outright killing anyone I pleased."

"And now?" Maiko Plasma asked, making the grin fall under the mask.

"Now...I don't know. I mean, I should be thrilled that so many humans are dead, but I just can't seem to." Do-S explained. "I can't understand it! And it's the same for Eyesight and Super Mouse too!"

"And me." Maiko Plasma added. "And I've been trying to force myself to hate them. I even try to think about killing them, but..." she trailed off in a cold sweat, her body trembling as a certain bald hero entered her mind. "Every time I do, I keep seeing him!"

"I don't blame you." Do-S replied, her own hands trembling. "That guy was not normal! I hit him directly on the head, but he didn't fall under my control. And not only did it not even hurt him, he broke it like it was nothing! Now I need to get a new one somehow!"

"Well, good luck with that." Maiko Plasma said before walking off, her thoughts turning to the future and what it may bring.

()

"Stupid apprentice." grumbled the gunner of the Dark Matter Pirates, his remaining eyes focused on the bar indicating when the artillery could fire at full power again. His hand went up to the stump that used to be his right eye stalk. "At least Lady Boros decided to be light with my punishment. A lot better than that idiot I had working for me." He then spoke up so his voice could be heard. "Okay, Lady Geryuganshoop! Bombardment preparations are almost complete! Shall I proceed as ordered?" He waited for a moment, only to receive no response. "Maybe she had to go to the bathroom? Well, when you gotta go, you gotta go."


"Hey! Lady Geryuganshoop!"

The alien esper couldn't respond, her attention fully focused on Saitama. Her earlier attack didn't even faze him as he just stood there staring up at her.

"Telekinetic? Like psychic power?" he asked. Her only response was a growl.

"You leave me no choice, worm. TELEKINETIC GRAVITATIONAL WAVE!" she bellowed. The other aliens in the room screamed in panic as they rushed from their chairs and ran towards the door.

Sadly, they weren't fast enough.

"DIE EARTHLING!" she shouted, her eyes glowing as the gravity in the room began to increase at an alarming rate. The ceiling started to cave, the monitors all cracked, and practically all the aliens in the room were flattened like pancakes. "It's useless! My unparalleled telekinetic powers allow me to manipulate the forces of gravity! Do you know what a black hole is, you ape? Inside one, the gravitational pull is so strong, even light itself cannot escape!" she boasted before realizing that Saitama was still standing, despite being sunk a foot into the floor. He casually raised his hand and scratched his cheek, completely unaffected by the gravity increase. When she realized it wasn't working, she changed tactics and levitated a mass of tiny rocks into the air before having them swirl around her fast enough to kick up a whirlwind.

"Now what are you doing?" Saitama asked as he watched the spectacle.

"TAKE THIS! TELEKINETIC SHOWER OF RUBBLE!" she roared as she used her powers to send the debris at him with enough force to blow a multitude of holes all the way out of the bottom of the ship and into the ruins of City-A below. She grinned at the dust cloud she kicked up, thinking that the fight was now over. "There! I got him that time!" Her smile quickly fell as the dust cleared, showing Saitama standing there and holding a small rock between his fingers.

"Psychic powers, huh? They'd probably be a lot cooler if you didn't waste them on just flinging rocks." he stated before looking up at her. "You don't need powers to do that. I'll show you."

She gasped as he raised his arm towards her, the pebble still in his fingers. Panicking, she erected the strongest barrier she could to defend herself from whatever he tried. She saw movement-

CRASH!

-and was now flopping under all the monitors she'd suddenly found herself smashed into.

'Wh...What happened?' she thought, her mind spinning and body full of pain.

"See? I didn't need powers to do that."

Her mind cleared in an instant as she looked up to see him standing a few feet in front of her and staring down at her with that same blank face.

"..ah...ahhh..." she squeaked out as fear gripped her heart, unable to even think of moving.

"GERYUGANSHOOP, YOU DUMB BITCH! WATCH YOUR FIRE! THAT LAST PROJECTILE DESTROYED ONE OF MY MARBLES!" she heard Melzargard roar, but didn't react at all. She could tell that her barrier deflected the rock, which must be what Melzargard was talking about, but was too focused on Saitama to think of anything at the moment. The two stared at one another before she finally spoke.

"...mercy..." she pleaded in a tiny voice.

"Where's you boss?" he asked her.

"...one moment." she said before thinking.

'Lady Boros! Help! The earthling's too strong for me! They want to fight you! What do I do?!' she mentally screamed.

'If he wants me, then lead him here. I'll fight him.' she heard Boros reply.

"I'll...take you to her." she told Saitama before slowly floating up and leading the way.


"This isn't good." Child Emperor stated from where he and Genos were still situated atop the Hero Association HQ. Genos looked at the readings on C.E's portable computer while the child hero contacted Sitch about the incoming threat.


"Has that been confirmed?!" the Bearded Worker asked in a panic as he stood amongst rescue workers bringing in survivors.

"Yes. Child Emperor has confirmed that an energy reading from inside the ship is increasing at an alarming rate." Sitch explained.

"What do we do about the civilians?!" BW asked in concern.

"Withdraw the search and rescue teams for now. Have everyone there take cover! You're about to come under heavy fire soon!" Sitch ordered.


An injured man stumbled through the ruins that was once City-A before collapsing to his knees, too tired to continue.

"Hop on!" came a voice.

The man looked up at the one who had spoken, a grateful smile on his face.


The gunner of the Dark Matter Pirates watched as the bar finally filled up, signalling that the artillery was ready to fire.

"There we go. Geryuganshoop still hasn't gotten back to me. They haven't told me not to hold fire this time, so it should be okay to do so. Let's see." they said as they readjusted the trajectory of the cannons, a screen zooming in closer to the ground. "From what I recall, the order was to fire at the enemies fighting Melzargard.


Puri-Puri Prisoner placed the marble he'd gotten from Melzargard between his teeth before biting it to pieces, causing another head to melt into nothing.

"Only two heads left! I'll bust those suckers wide open!" Metal Bat declared as he, Silverfang, Atomic Samurai, and Puri-Puri Prisoner prepared to continue the fight.

"Is it time yet?"

"Ship bombardment coming, real soon." spoke Melzargard's two remaining heads.


The gunner smiled as he finally zoomed in on his target before pressing the launch button.

"Bye bye problems." he said as he watched the shells head for the surface, only to blink in shock when they stopped out of the nowhere. "What the?! What happened?!"


The heroes and Melzargard stared up at the shells that had stopped just above them all in confusion.

"How did...?"

"They just stopped."

They all turned to see Tornado staring at them, an aura surrounding her.

"All of you muscleheads would be dead without me. Can't you finish one small fry?" she scolded before levitating. "Maybe you should all start over from Class-C." She returned her gaze to the ship before pointing a finger upward, causing the shells to turn and point back at the ship. "Hey aliens. Take these back, okay?" she said before launching them all back at double the speed. Everyone on the ground watched in awe as the underside of the alien craft lit up with explosions, severely damaging the ship and wrecking their cannons.


"...I wanna go home." the gunner moaned in terror as the ship shook from the explosions.


The Bearded Worker watched as the rescue teams carted the injured survivor away before turning to the hero.

"I didn't know you were out here. Thank you so much, Mumen Rider." he said in appreciation.

"I'm sure there are more survivors out there. Where should I look? Narrowing the search area will save lives!" he said, ready to go back out to help.

"I'm not sure..."

"Please! I'm ready! I'll go rescue them right now!" pleaded the hero.

"HEY!"

Both men turned to see a pick up driving towards them. Inside were Stinger, Lightning Max, Heavy Kong, Twin Tail, Golden Ball, Spring Mustachio, and Shadow Ring.

"Need a hand?" Golden Ball asked from the driver's seat.

"W-What are you all doing here?!" Bearded Worker gaped in shock. "You're supposed to be recovering in the hospital! And where did you get that truck? Last time I checked, none of you had a vehicle like that!"

"Uhm..." they all said in unison.

-Flashback-

A man was coming out of a convenience store with a fresh pack of smokes in his hand. He prepared to light one up before it fell from his mouth.

"Wh-Where's my truck?!" he yelled as he looked around before noticing a note stuck to the street light he parked under. He ran over and ripped it off before reading it.

Borrowing your truck! Thanks for helping us do our duty!

-Hero Association

-Present-

"Never mind that! Anyway, we're here to help!" said Stinger.

"And a few scratches like these won't stop us doing our duty." Spring Mustachio added.

"You guys." the Bearded Worker muttered with a grateful smile.


Seeing as the bombardment failed, Melzargard had had enough. His heads roared as his arms transformed into tentacles that lashed out at everyone. Metal Bat either dodged or smashed anything that came near him before they were all grabbed by Puri-Puri Prisoner.

"Nice catch!" Bang yelled as he took the opportunity to strike. He ran up the alien's arms before swiftly attacking the head on the right, a marble now resting between his fingertips.

"I found it. Begone!" he growled as he broke the marble before landing on part of what used to be a building. "Only one left!" he declared.

"GRAAAHHH!" Melzargard yelled as he detached part of the arm that PPP had before curling it up and sending it towards Silverfang. The old hero didn't have time to react as it struck him in the side, sending him smashing through more debris before coming to a stop.

"SILVERFANG!" Atomic Samurai yelled in panic, afraid that his friend had been done in.

"No...a direct hit!" Iaian gasped in horror as they all stared at Silverfang's unmoving form.

"HAHAHA! Weak! WEAK! You're all so very weak! Dead after a single hit!" Melzargard laughed as he turned back to the remaining heroes. "A change in tactics was all I needed. If I forget defense and focus on my attacks, this'll all be over soon. You're next, swordsman!" he declared as his arm began to shift and contort. "I will spring past that blade and squeeze your skull 'til it pops!"

"If you think you can do that, then be my guest!" Atomic Samurai challenged with a rage-filled glare.


Boros sat in the throne room, the Power Sphere shining in the wall behind her. All was quiet before she uttered two words.

"He's come."

With an almighty crash, the door to her room was smashed open, sending debris everywhere.

"ARE ALL OF YOU EARTHLINGS VIOLENTLY SAVAGE LIKE THAT?!" Geryuganshoop screamed, none of which fazed Boros. The cycloptic alien merely kept her gaze on Saitama, who hadn't moved from after he'd punch the door down.

'The finest warrior this planet has to offer.' she thought as she felt the power rolling off of Saitama, an aura of energy that she could almost see surrounding him. 'I can't sense no limit to his energy.'

"Are you the boss of all these aliens?" Saitama asked her.

"Wonderful!" Boros said with a smile, confusing the hero for fun as she stood to her full height. "Before we fight, let us exchange names. I lead the pirate group known as Dark Matter, and I am the Dominator of the Universe. My name is Boros!"

"I'm a hero for fun. I mean, a professional hero, and my name is Saitama." the bald hero greeted.

"Saitama." she said as she grinned at the man.

"Look, I don't know what the Denominator of the Universe wants with Earth, but you sure made a mess of City-A." Saitama pointed out.

"My apologies. One of my former crew thought to impress me by making a preemptive strike on your planet." she explained, her eye going to the splatter on the far wall. "They have been appropriately punished. As for why we have come to Earth?" she said as she began making her way towards Saitama. "There exists a prophecy."

"Prophecy? What do you mean?" Saitama asked.

"I was once a traveler, exploring the universe, looking for strong opponents to fight and planets to bring under my heel." she began. "But before long, I realized that none could challenge me. I began to experience the pain of utter, all encompassing boredom.

'Boredom from being too strong? Sounds like me.' thought Saitama.

"But one day, I met a seer. They said that somewhere in the universe was an opponent who was my match. One who could rekindle my passion for fighting. That was nearly 20 years ago. Have you any concept of the distance I've traveled?" she asked as she stopped in front of him. "My men thought the prophecy was a ruse. A fairy tale made up to focus my tension and lure me away." Her grin widened as she gazed down at Saitama. "But now I'm certain it was true. Come, and give stimulation to my existence! That is why I am here!"

POW!

Without warning, Saitama had punched her into one of the many pillars in the room.

"LADY BOROS!" Geryuganshoop cried out in alarm.

"Are you an idiot? You can't just go around ruling planets and hurting others because you're bored. There are better things to do. Why not get a hobby?" he said, his fist still out and smoking.

Boros said nothing as she pulled herself out of the pillar. Her movements confused Saitama until her armor seemed to light up before breaking off.

"I must thank you." she said as she stretched a bit, relieving her knockout body free of the tight fighting armor. "Not only was that suit of armor very constricting, but now I can unleash my full, unimaginable power against you."

"...ok." was all Saitama said.

Geryuganshoop trembled before bolting out the door, leaving Boros to grunt as her body began to light up. Her skin changed into a navy blue, her spine and muscles bulged out, and the red core that rested under her voluptuous breasts changed into a bright yellow eye that matched the one on her face. The power she was emitting was blowing wind everywhere as what looked like electricity sparked all around her form.

Saitama merely watched it all unfold, his face not changing one bit.

After a few more moments, Boros's full power was now ready to be unleashed.

"IT IS TIME!" she roared as she charged at Saitama.


A/N: We wanted to make her actions not as homicidal as they were in canon so as to make it more plausible to spare her later on. Hope you all enjoyed.