The Octotron's massive tentacles came down on the Megasquid, adding more damage to the mech. It threw the Megasquid into the plaza, the very heart of Inkopolis, nearly destroying Booyah Base. Nathan managed to grab one of the Octotron's tentacles, ripping it off and discarding it, placing it away from building to do no damage.

"You're really starting to get my nerves now!" Octavio said as the two mechs continued to fight, with Nathan managing to lure Octavio away from the plaza, "And that is why I'll squash you like an insect!" He kept swinging at Nathan, who was trying desperately to keep the mech in its feet. "The Octarians will prevail!" The Octotron jammed two of its tentacles into the Megasquid's left shoulder.

"Ugh...no!" Nathan said. The Octotron then used its tentacles to sever the Megasquid's entire left arm. Nathan gasped. The Megasquid would not work against the Octotron.

"I found my mech, too!" said Octavio as he had the Octotron knock the Megasquid to the ground and slammed its foot on its back. "Only I repaired and revised mine manually...so I could sort out the flaws! I don't know what you used, but it didn't work!" The Octotron's arm rose into the air, preparing the slam through the Megasquid's core.

Thankfully, Nathan escaped of the mech through a hole created when the arm was ripped off. The Octotron's arm slammed down, piercing through the Megasquid's torso, crushing its core. Nathan hid behind a building for temporary cover. The entire city was silent, unable to believe what just happened. Nathan knew he had to confirm he was okay, or his team's morale would decrease enough for the Octarians to win.

"Nathan to all units!" he said through the headset. Everyone was relieved that Nathan survived.

"Nathan!" said Diana, "You...You lost?!"

"No...not yet! The Megasquid may have failed, but I still have the Power Spark AND a secret weapon!" He took out his canned Inknado special. "Everyone, listen! If I can get a perfect shot of an Inknado right in the Octotron's core...it could tear it apart! It's heavy damaged, so we still have a chance!"

"How are you gonna aim at it, though?"

"That's why I need you guys!"

"He's right!" said Smith, "I've analyzed that thing! If we can get enough ink on its feet and the ground, we can slow it down a lot!"

"I need as many available agents as possible to help Nathan!" order Cuttlefish, "Now!" With the fate of Inkopolis at stake, and with most of the attacking Octarians subdued, most of the agents headed right for the Octotron.

"Let us help, too!" yelled Jason as he and the Elite Five entered the battlefield.

"Diana! Cover Nathan and make sure his plan isn't foiled!"

"Consider it done!" said Diana as she ran to Nathan's side.

"Glad you come over," said Nathan, "Now I can watch over ya!"

"Hehe! I could use backup too!"

"Yeah, now c'mon!"

"Right!" Diana equipped her charger.

"Follow me!" Nathan ran to the building nearest to the mech, the Squid Sisters' studio.

"We'll help you guys!" said Callie as she and Mari approached.

"We know this place like the back of our hands!" said Marie, "It's big through, so it may take us a bit to get to whatever floor you need to get to."

"The roof," Nathan said.

"Wait what?!"

"I need to get to the roof, the highest level! It's high enough for me to unleash a perfect shot at the core!"

"Okay..." said Callie, "Normally we don't do this but...it's for the city! Consider it a VIP pass!"

"Callie, stop fooling around!" said Marie.

"I'll try Super Jumping up to as high as I can go, and I'm climb up the rest of the building!" said Nathan, "The rest of you go inside and find anything you can to help the other agents! Meet at the roof!" Nathan super-umped high into the air, grabbing a pole on the building as the other three entered the building. Meanwhile, Nero and Titan were still brawling, with Nero trying to retreat to the plaza. Titan caught up with him, however, and the two continued their fight.

"You think you can beat me?!" Nero said, "I'm no ordinary Octarian general, you know!"

"Yeah, I do know!" Titan said, "But I can still-"

"Shut up!" Nero delivered a sucker punch to Titan's face and then a sweep kick, tripping him. He pinned him to the ground.

"Told ya so! Not so powerful now, huh...Agent 3!"

"Yeah? Well what if I told you I did that on purpose?"

"What?"

"To buy my PARTNER some time!"

"What part-" Nero suddenly a powerful force on his back that knocked him forward a bit. He turned around to see none other than Champion X, equipped with a silver Rapid Blaster, charging at him. He wore a black cape with a large "X" on it now, plus a standard Hero Suit 2.0. Caught off-guard, Nero drew a blank on what to do.

"This is not your city!" Champion X said as he beat Nero mercilessly with punches, kicks, and even swinging his Platinum X Roller at him. Titan joined in, aiding X. As this happened, Octavio tried to deal with the surrounding agents, but they kept firing ink at the ground and the Octotron. The Elite Five cleared paths for agents to take while the rest did what Nathan and Cuttlefish had ordered. They could not lose this fight.

Nathan the others continued their climb up the Squid Sisters studio, with Nathan literally climbing up the exterior and the other three traveling up the building from the inside. They saw agents and citizens rushing towards the Octotron, many dying but the Splatoon still managed to make some progress.

Ink was sprayed in all directions, from both Inklings and Octarians. The Octotron wasn't struggling, but the continuous amounts of ink started to have its effects. The Octotron was slowly getting weaker, much to Octavio's annoyance. The plaza was turned into a battlefield. Nearly every Inkling in the city was fighting back. It showed the great determination the Inklings had to keep their city away from Octarian clutches.

As Diana and the Squid Sisters continued, Diana noticed something out of a window. Curious, she opened it to see the Power Spark stuck in a street lamp, which was now turned off. She noticed Nathan was a few meters above it, climbing. Diana realized she could help Nathan. She grabbed the Spark, pulling it out of the lamp.

"What are you doing?" said Marie.

"Getting a tool I can use to help Nathan!" said Diana.

Meanwhile, the Elite Five, Abigail, and Smith did recon as they splatted Octarians. Abby used two Aerospray XGs to get rid of octopus mobs, Smith fired a Hero Charger at Octarians from afar, and the Elite Five did the rest. They made their way to the plaza to provide aid in the Octotron battle.

Meanwhile, X and Titan had finished beating Nero. Yet despite his defeat, Nero still stood up, though he barely could. He breathed very heavily, covered in bruises and a few cuts.

"You shouldn't have come after our city!" said Titan.

In an act of desperation for the Inklings to spare his life, Nero said, "Wait, wait! X! We need a truce! All I - and Octavio - want is a small portion of the city for us Octarian to have. Besides...Who would you be without ME, Champion?"

"Guess it's time to find out," X said in cold blood as he kicked Nero in the stomach, launching him into a not-so-sturdy wall of a building, damage by the fight between the Megasquid and Octotron. It was so damaged, that the wall collapsed. The debris fell down on Nero, seemingly crushing him under the ruble. "We will not give up the city."

"Thinking back...Wasn't that a little extreme?" said Titan.

"...I wanted to solve this without violence. But sometimes, one is left with no other choice...especially when it's a man like him."

"...I guess you have a point."

"Now c'mon! Let's go help the others take down the Octotron!" Titan and X ran to the plaza, where so much ink had been fired at the ground and the Octotron's feet that the Octotron was now like an Inkling in enemy ink - slow and maybe even stuck in the huge puddle.

"Ugh! Come on! WORK!" said Octavio as he tried to get the mech out of the ink. Nathan reached the top of the Squid Sisters building, but the Octotron wasn't facing him. He had to destroy the core with his Inknado, but he needed a clear shot of it.

"Agents, get him to face the Squid Sister's studio!" said Nathan. Titan, X, the Elite Five, Smith, and Abby arrived at the plaza. The Great Zapfish, wrapped around the infamous Inkopolis Tower, was well aware of what was going on, even though it showed its normal straight face. The agents tried and struggled, but managed to get the Octotron facing Nathan. "Now keep him still!"

"How?!" said an agent.

"You will not simply take me down!" said Octavio, "IT'S TIME TO D-" He halted when he noticed the systems of the Octotron were glitching out a bit. The level of power decreased slowly, and he soon realized the cause - the Power Spark. Diana had thrown it at the Octotron's leg, and it was now draining power. "WHAT?!"

"Nathan! Down here!" said Diana, popping her head and arm out of a newly-made hole in the glass window where the Squid Sisters recorded their news broadcasts.

"Diana!" said Nathan as he lent her a dead wire and she climbed up to the roof. "How did you get the-"

"You dropped it, apparently."

"YOU LITTLE SHITS!" yelled Octavio, "But you're not gonna get this core destr-" He was halted again when something unexpected occurred. Octavio tried to move the Octotron, but something was restraining it. "Wh-What is-" He gasped when he realized it. Wrapped around the Octotron was the Great Zapfish itself. "What?! This thing actually has a BRAIN?! It's smart?!"

"A Zapfish that can fight back!" said Cuttlefish excitedly, "Ha ha! I...I don't believe it!"

"Now Nathan!" yelled Titan, "Launch the Inknado! Finish the war!"

"Only got one shot at this!" Nathan said as he activated the canned special. His hair glowed bright as the Inknado Launcher appeared in his hands. He aimed carefully at the revealed core of the Octotron. "Well...this is it! The moment of truth!" The weapon charged.

"NO!" yelled Octavio.

"C'mon, Nathan!" said Diana.

"Fire that bad boy!" yelled David.

"Hurry!" said Smith.

Nathan mumbled to himself, "Please...let this work!" Closing his eyes tightly, Nathan pulled the trigger. The spherical missile launched itself at the Octotron. There was complete silence as it traveled. Everyone looked with widened eyes and some people looked with their jaws dropped. Nathan slightly opened his eyes to see it.

The missile made a direct hit with the Octotron core. The Great Zapfish quickly unwrapped itself from the Octotron and wrapped back around Inkopolis Tower. After a few suspenseful moments, a huge blue ink tornado burst out of the Octotron, tearing it apart. Like a true tornado, the pieces of the mech where scattered throughout the twister, being pulled away and blown through out the spiraling monstrosity.

After the tornado died down, pieces of the mech dropped down. Thankfully, no one was harmed by the falling debris. The sun began to raise over the horizon, signalling a new day had begun. A huge puddle of blue ink covered the plaza in front of Inkopolis tower. There was pure silence. Octarian forces retreated away from the plaza and attempted to run out of the city. Some were caught and others did manage to successfully escape.

Nathan and several others noticed something in the blue puddle. Octavio, greatly weakened yet somehow still alive. He moved very slow, and much of the heavy armor on his upper body was destroyed.

"Diana..." said Nathan, "...I need a charger."

"I know what you're thinkin'," said Diana as she lent Nathan a Hero Charger. He jumped down into the puddle and slowly walked towards Octavio, who had finally accepted defeat. Cuttlefish stood close by. There was a complete silence.

"Cuttlefish...All I ever wanted...was the survival of my race," said Octavio, "You must see why...I had to betray you that day...100 years ago..."

"You didn't betray us, my friend-now-enemy," said Cuttlefish, approaching, "...The only thing you betrayed...was yourself and your species. You had a second chance, and you didn't take it. You killed hundreds, maybe even thousands! But today...that ends."

"This could've ended another way," said Nathan as he pointed the Hero Charger at Octavio's head, "But you chose the other way. I actually feel sorry for you...but you leave me no choice! You will pay for all you've done!"

"N-No, Nathan!" said Octavio, but he couldn't say anymore before Nathan pulled the charger's trigger, splatting and killing Octavio forever. His armor scattered around where he died, sitting there.

The war was finally over.