In the Winged Firestorm Pro 2.0, Bowser Jr. was sitting in the metal dragon's head, flying it to the Yggdrasil. Inside the stomach of the vehicle, Mario, the replicas and the originals, Cloud, Villager, Lucas, Little Mac, Shulk, the three divine beings, Bayonetta, Ridley, Greninja, and all the lost veterans were positioning, prepared to drop down onto the tallest building made by the Subspace Army. Link, straightening his Champion's Tunic, sat next to Cloud Strife, sighing as he looked with determination.
"Cloud?" Link asked the 1st-class SOLDIER.
"Yeah?" Strife replied in question as he looked to his left.
"I felt like…" Link sighed, "Back at the Midair Stadium, I was just about to say something to everyone before we got involved in this fight."
"What were you trying to say?" Cloud asked the Hylian. Link tossed his dirty blond locks behind his pointed ears, looking down at the burned ground from on high as the wind blew across his face from the opened shaft.
"I was just about to tell everyone how much we love each other, no matter how tough things seem to get," Link answered. "Hopefully you'll understand, since all of the other warriors are too fixed in the intense battle." Just then, Zelda walked to the two boys, holding the headset device in her hands.
"I hope you two boys are listening," Zelda said. "With this thing, we might have answers to our mysterious past. However, there's one victim of the Subspace Army who is on no one's side: Shadow Mewtwo. That Shadow Synergy Stone might be torturing him mentally, so we need to destroy it from within as fast as we can."
"Where would we find him?" Cloud Strife asked, Mario and the others looking at the princess. Zelda then pointed down on the middle floor of the Yggdrasil, where there was a huge glass window reflecting the lightning from the black-red cloud above them.
"Are you sure?" Snake asked the princess.
"Either we're correct, or we all die from Shulk's miscalculations in his visions by some powerful monster from inside," Zelda answered. Everyone looked at Shulk, worried about what might happen next.
"What?" Shulk said. "The Monado Arts aren't 100% accurate…" Ridley shook his head in annoyance before Bowser Jr. walked down, readying his position to jump in.
"Everybody ready?" Bowser Jr. asked. All the fighters in the team gave a thumbs up, the Pokémon Trainer releasing Squirtle, Ivysaur, and Charizard. Relaxing themselves, the whole gang jumped from the Winged Firestorm Pro 2.0, falling down and positioning themselves above the glass room as the dragon circled around in the black-red cloud. Red jumped on top of Charizard's back while Ivysaur and Squirtle hung on, and Lucas was crying in fear before Rosalina's Luma grabbed ahold of him, pulling him close to its mommy. With high winds on the rise, almost everyone positioned perfectly.
"You have the get out here before I kill you," Shadow Mewtwo telepathized, tears in his bloodshot eyes. Inside the glass room, the Ultimates Reborn have found Shadow Mewtwo, surrounding him as the pain from the Shadow Synergy Stone worsened. Purple sparks were generating from the palms of his hands, but the Brawler Ultimate Reborn pulled out the Assist Trophy Capsule given to them from before.
"We know," the Swordfighter Ultimate Reborn answered, "but this mysterious guest will kill you first when we get out of here." Suddenly, the fighters that emerged from the metallic dragon crashed through the glass wall, with Bowser Jr. himself yet to be seen. Once the Ultimates Reborn looked at the direction of the collision, Shadow Mewtwo grabbed ahold of the Assist Trophy Capsule, but the three warriors knew they wouldn't let their guard down. As the small team approached closer, Shadow Mewtwo and the three Ultimates Reborn tugged harder on the Assist Trophy Capsule, eventually having rainbow-colored sparks generate from the glass rim of the item, showing more signs of breaking when all of a sudden, the glass bursted. The mysterious figure that was trapped within showed signs of forming as the light started dimming, and everyone in the room was surprised.
"Is that…?" Zero Suit Samus asked. Samus started charging up her arm cannon, knowing who this mysterious enemy is. From the Assist Trophy Capsule, a black figure that looked very similar to Samus was slowly getting up, glowing blue veins pulsing on her black exoskeleton as she rubbed the strangely-formed arm cannon with her alien hand. The markings on her helmet were different, showing that there was nothing human about her at all.
"Dark Samus," the Gunner Ultimate Reborn said, helping the other two of the Mii Fighter leaders up. "Sephiroth specifically asked for the son of Dracula to emerge! Why are we so unlucky!? Whatever… Warrior of pure Phazon, get rid of these losers…" The three Ultimates Reborn then started running out through the exit, leaving Dark Samus to face Mario and the gang. Shadow Mewtwo was still clenching his body, shooting black lightning from his fingers. He suddenly zapped Dark Samus before she approached the warriors, knocking her deep into the ventral system underneath them. Shadow Mewtwo then started telepathizing in pain, the Shadow Synergy Stone on his left shoulder close to breaking. Samus and Zero Suit Samus grabbed ahold of the possessed Pokémon while an alarm was sounding off, calling in Fighting Mii Team troops.
"Link and I will follow the Assist Trophy," Cloud Strife said to his friends. "The rest of you will have to take care of Shadow Mewtwo and destroy those Shadow Bugs within him." Cloud then grabbed ahold of Link, grabbing him close by the right side of the Hylian's waist. Holding each other close, the two warriors jumped down into the ventral system, away from everyone else.
Meanwhile, Bowser Jr. realized the strong winds that pushed him away from everyone else to their destination, and he was still falling, but through another room thousands of feet up. Once Bowser Jr. crashed through, he broke right through the strong supportive floor, slowing his descent. Also, when the Koopa Prince landed, he ripped a hole right in front of Sonic and his crew, who were just running to the top of the tower.
"Weepy?" the Inkling chirped.
"You're damn right 'weepy'," Sonic answered, looking through the dark floor along with Meta Knight and the others. "Someone's down there, and it doesn't look pretty…"
Bowser Jr. stirred from his unconsciousness, looking around the dim room he was stuck in. As he slowly got up, he noticed his Junior Clown Car was right in front of him, but the young Koopaling himself was covered in some sort of sticky goop, almost like a giant spiderweb, having him barely budge as he tried to crawl closer to his personal vehicle. The stone-textured room led down to a dark hallway, almost like an abandoned hospital in a horror film. Bowser Jr. then started getting terrified as the lights started flickering, showing gruesome images of actual living corpses crawling closer to him. The more the lights started flashing, the more the weak Koopaling could make out the zombie faces: pale, rotting skin, bleeding mouths, ragged clothes, dislodged jawbones, gouged eyeballs, basically anything gory, making Bowser Jr. feel terrified and queasy at the same time. Other monsters creeped out from the shadows: giant spiders, mummies, poltergeists, and mysterious creatures lurking in the darkness. Before any of the monsters even got as close to Bowser Jr. as they possibly could, a chain-like whip lashed right in front of them, breaking some of their limbs off. Bowser Jr. then turned his head to his right, noticing a figure right in front of him. Some of the zombies limped to the direction of the attack, but the figure tossed a bottle of Holy Water, which turned out to burst into a pillar of flames. As the fire from the Holy Water burned the cobweb that Bowser Jr. was stuck in, the Koopaling climbed back into his Junior Clown Car, looking at this strange warrior. Wielding his chain whip, the stranger looked a little like a barbarian, with blond hair supported by a metal bandana-like accessory, wearing ragged clothing and fur boots. Tucked in his neck was a necklace with a strange cross in the front as the stranger took it out for a brief moment before kissing it gently and putting it back in his uniform's neck collar. The warrior then pulled out an axe, throwing it like a boomerang as it sliced more of the zombie enemies. Jumping down from the hole, Sonic, Meta Knight, Mega Man, Pit, Inkling, Daisy, Lucina, and PAC-MAN saw they were cornered by unnatural enemies.
"Simon Belmont?" Sonic asked. The warrior turned to the blue hedgehog, confused.
"Do I know you?" Simon remarked in question, grabbing a zombie by the neck.
"Sorry," Sonic said, rubbing his face as rotting limbs were flung past the warriors. "It's just that I'm a very big fan…" A giant spider then crawled down from the leaking ceiling, but Sonic grabbed its eight legs as Lucina rushed in, slicing the creature's limbs off. More monsters started walking towards the fighters, with Bowser Jr. regaining a little courage as he sent out a small troop of explosive wind-up toys to blow up on impact, standing next to Daisy. Lucina and PAC-MAN readied their weapons next to Meta Knight, while Sonic the Hedgehog paired up with Clementine the Inkling. Pit and Mega Man stood next to Simon on both sides, preparing to attack.
"Pit, Mega Man, and Simon all teaming up to fight monsters," Sonic said. "For some reason, I feel VERY uncomfortable…" The zombies and the monsters lunged themselves at the fighters, snarling and groaning. Simon Belmont began lashing his Vampire Killer, followed by a series of heavy kicks. He flung a throwing cross at the mysterious creatures, scaring them away as Mega Man fired a series of sticky bombs. Pit flew in, firing his arrows from Palutena's Bow, piercing the monsters and killing them on impact. Bowser Jr. teamed up with Daisy, pelting the poltergeists with cannonballs and turnips and scaring them off. PAC-MAN then joined the other two fighters, throwing pixelated fruits at some of the incoming giant spiders, spraying water from his fire hydrant, and punching some of the monsters in the face. Lucina and Inkling stood side-by-side, running around each other in a circle while attacking the zombies surrounding them. Lucina stuck out her Falchion, slicing the zombies in half, while the Inkling rapidly jabbed with her Splattershot. Meta Knight and Sonic were cornered by a few zombies, attacking with the style of fighting they're best with.
"Careful, my blue comrade!" Meta Knight groaned, blocking an attack from one zombie. "One bite from their virus-infected mouths will turn you into one of them!"
"You don't think I know that!?" Sonic replied in question, stretching another zombie's mouth beyond its limit to dislocate the lower jawbone and break the monster's neck. "I've watched plenty of zombie media to get the idea! I know what happens next when you become defeated by the undead!" Sonic then kicked the zombie's head off, sending it flying to another zombie's face, followed by a spindash from the blue hedgehog himself. After the surviving monsters retreated back into the darkness, Simon and the small team congratulated their victory, clapping in relief that the scary room was cleared. Well, everyone except for Bowser Jr., anyway…
"Look at all of you, the High-and-Mighty team…" Bowser Jr. sighed, hiding in his Junior Clown Car. "You're not afraid to stand up to those monsters, and I was really just a wimp trying to get back to my papa…" The young Koopaling sat upright in his personal vehicle, the face on the car sad and terrified. Sonic slowly walked towards him, showing some signs of comfort.
"It's alright, buddy," Sonic said. "You at least got credit for trying. I mean, we have a pretty powerful warrior on our side, trapped in this room for God knows how long…"
"You just don't understand," Bowser Jr. objected, his voice slightly breaking. "I've been away from my papa for ten years, hopefully becoming part of the Subspace Army to reunite with the only family I have left…" Tears started building up in the Koopaling's eyes, and the fighters looked at the sobbing prince. Simon let go of the door handle in the dark hallway just to walk towards the terrified Koopa prince.
"Now, there just might be a day where my papa might die from… those things… and I might never see him again, not even knowing the good deeds he did against the Subspace Army…" Bowser Jr. then started bawling, crying as loud as he could as more tears built up. Sonic and his team started getting irritated by the spoiled prince, looking at the dark hallway.
"I guess we should be going now," Simon said, opening the door. "I've been searching these halls and still haven't found an answer to destroy this resource building."
"Yeah, I guess we should get going…" Sonic groaned, grabbing the Junior Clown Car by its rim with Bowser Jr. still inside, crying loud in sadness that he might never see his father again. All the other fighters then walked off, following Simon Belmont. Pit looked at Mega Man, slightly confused.
"Did Sonic say we look uncomfortable with Simon?" Pit asked. Mega Man then scoffed, grabbing Pit by the wrist and dragging him to the others, ready to leave this nightmarish room.
