Meanwhile, Mario, Luigi, & Y/N's family are in their dining room, enjoying their Italian meal.

"That's beautiful. You made these, right?"

The dining room starts quaking as Mario, Luigi, & Y/N's family alertly watch.

"Huh? Whoa?"

The Warp Pipe in the underground sewer shoots Mario out of a manhole, and Mario crash-lands onto the ground before getting up.

"Huh?"

Mario realizes he's back in Brooklyn.

"Brooklyn?"

Foreman Spike almost hits Mario with his truck before hitting the brakes.

"Mario?"

Foreman Spike gets out of his truck and lifts Mario by his overall straps.

"You almost dented my-"

Bowser's Castle and several Mushroom Kingdom debris emerge from the pipe. Peach, Toad, and Donkey Kong get trapped under debris while Luigi frantically takes cover inside a dumpster. The Super Star is launched from Bowser's Castle and lands a short distance from Mario. Bowser furiously gets up. Beneath him is Y/N, who's unconscious but not battered, as Bowser had protected her from the debris.

"MARIO!!" he yelled.

Mario races toward the Super Star but Bowser blocks him.

"YOU WANT THIS?!"

He brutally grabs Mario by the arm and holds him up. Mario exclaims fearfully. Bowser snarls and gives him a massive sucker punch, sending him flying backward into a car's windshield. Bowser breathes fire at Mario who dodges the flames.

"YOU RUINED MY WEDDING! I WAS FINALLY GONNA BE HAPPY! NOW YOU WILL SUFFER — LIKE ME!!!!"

Bowser blasts Mario into the Punch-Out Pizzeria with a mighty whack of his tail.

"You really thought you could stop me?! You worthless, weak little nothing! COME OUT AND FIGHT! Or are you too scared?"

Mario doesn't respond, holding his arm in pain while hiding behind the chair, which makes Bowser cackle.

"Just what I thought."

Princess Peach rushes over and jumps into the air in a spinning kick at Bowser, who grunts. Then Donkey Kong bodyslams into Bowser with a punch, knocking Bowser over. This angered Bowser even more. With an enraged bellow, he turns his attention to his attackers and fights back. He knocks Princess Peach, Donkey Kong, and Toad off with his arm, then roars at them before charging at them. As Bowser was about to charge at them, a large stone was thrown at his face disorienting him a bit. Bowser and the others looked to see Y/n, her dress slightly torn, hair still up with her veil, and sword in hand.

"Y/N!!" Princess Peach cried out, happy to see her friend. Y/N turned to smile at her friend before turning to glare at Bowser.

"That is it," Y/N said, stabbing her sword in the ground before she grabbed the bottom of her dress and ripped it, making it now a two layer high low skirt sweetheart neckline dress, her sleeves still on.

Y/N grabbed the amethyst necklace and proceeded to throw it across the street. She then reached for her hair and let it loose, tossing it back and forth, from where it sat.

"You can do whatever you want, but no one calls my brother a coward and gets away with it."

Taking up her sword, Y/N summoned her wings and charged. Bowser luckily blocked her sword with his claws, but he didn't see Donkey come from the side and propel him into a building.

Y/N then knocked him down as she gave him a kick to the face, sending him flying as he bumped into the car. He looked up to see her marching over to him.

"Y/N... I don't want to hurt you." he pleaded. "Don't make me do this."

"Sorry, B. But you don't have a choice." she said, pointing her sword at his face.

Instead of hitting her back, Bowser knocked her to the side before charging at Donkey Kong and Peach. Y/N was about to help them when Bowser suddenly ordered the Koopas.

"Restrain her!"

Before she could act, Y/N was held by the Koopas as they made sure she stood still. Toad rushes over to help her when more Koopas comes and restrains him as well as Bowser easily defeated them and overpowered Donkey Kong. Bowser punches the ape, grabs him by the throat and lifts him up. He lashes his claws out, preparing to finish him off. But...

"Hey! Leave him alone!"

They turned to see Mario walking out of the restaurant, standing tall while looking bruised up. Y/N and Luigi were surprised at his bravery while worried for him.

"Mario..." they both said in unison.

Bowser released Donkey Kong and turned to Mario with a sneer.

"You just don't know when to quit!"

"Yeah. I've been told that before." Mario stated with a smile, rubbing the back of his neck.

Peach smiles, remembering the conversation she and Mario had after the latter defeated Donkey Kong. Just then, she sees Kamek with the Super Star and gets an idea.

"Mario!"

Peach respectively shoves and pushes two Koopa Troopas to the ground, and kicks a Green Shell over to the Super Star, sending it flying.

"The star!"

"No! That's MINE!"

They both run after the Super Star. Bowser breathes fire at Mario, but Luigi blocks it with a manhole.

"Lu..." Mario voiced out.

"Nothing can hurt us as long as we're together." Luigi said, repeating what Mario used to say to him.

As the manhole starts to bend, Mario reaches a hand to Luigi, who takes it as the two leap towards the Star. Y/N broke free and the three tumbled toward the star just when it looks like Bowser's Fire Breath hits them.

"No!" Peaches yelled out in shock while Bowser looked in disbelief that Y/N flung herself into his fire.

But as the smoke started to clear it started to be more colorful as it slowly revealed Mario, Y/N, and Luigi with a rainbow like aura. Y/M spreads her wings to reveal iridescent wings with gold lining.

Bowser tries to stomp the brothers to no avail.

"Huh?!" Bowser exclaimed in shock before being upper cutter by the brothers and high-kicked by Y/N. He was sent flying back to his army before jumping up and pointing at the trio.

"RIP THEM TO PIECES AND BRING ME Y/N!" Bowser yelled as his army charged.

Koopas, Spinies, Shy Guys, Hammer Bros, Sledge Bros, Goombas, Buzzy Beatles, Koopa Paratroopas and Piranha Plants follow Bowser's orders and rush towards the Mario Bros. Invincible Mario, and Invincible Y/N, and Invincible Luigi nod at each other and split up. A Sledge Bro tries to hit Invincible Mario but the hammer gets destroyed and Invincible Mario throws the Sledge Bro at the Koopas, while Donkey Kong jumps with Peach and Toad in his arms. A Shy Guy is jumping on a whimpering Spike as the Dry Bones, Snifit and Hammer Bro watch. Invincible Luigi defeats Dry Bones, uses its shell as a shield to block Hammer Bro's hammers and defeats both the Hammer Bro and Snifit. Invincible Luigi grabs on a Shy Guy's strap, before letting it go, sending the Shy Guy flying.

"Oh, hey, Spike!" Luigi said before he zoomed off as Spike looked up in surprise.

"Luigi?!" Spike exclaimed before he saw Y/N flying overhead, fighting off some of the goons, her sword catching the light. "Y/N!!!!!!"

Invincible Mario and Invincible Luigi run side by side and zoom into the Koopa Army, defeating them, the Spinies, Hammer Bros, Piranha Plant, Shy Guys, Buzzy Beetles and Goombas with Invincible Y/N flying beside them. Invincible Mario and Invincible Luigi jump on the Bullet Bills and Paratroopas, defeating them. The scene goes in slow motion as the Mario Siblings' parents are awed by Invincible Mario and Luigi. Time goes back to normal speed as the Piranha Plant traps them both with its jaws, much to the parents' horror...

"No!" they exclaimed.

"Oh, no you don't!!" Y/N yelled as she shot a beam of light at the plant to stun it before kicking it to let her brothers out. Her parents are looking at their children in awe and pride.

"Mamma mia!"

Bowser throws a car at them, once again to no avail, as Invincible Mario and Invincible Luigi move through it before grabbing a power line and using it like a trapeze to kick him. Bowser tries to crush them, but Invincible Mario slides underneath him and grabs him by the horns to throw him on the ground. Invincible Luigi headbutts Bowser and uses a mushroom as a trampoline. Invincible Y/N high-kicks and bicycle-kicks Bowser as Invincible Luigi throws a block at him, causing the Koopa King to collapse. Invincible Mario and Invincible Luigi grab Bowser by his tail, spins him around, and tosses him up in the air. Invincible Mario, Invincible Y/N, and Invincible Luigi jump up high and punch Bowser, sending him to the ground, causing a giant crack on his castle. Invincible Mario and Invincible Luigi front-flip and prepare the finishing double-curb stomp. Bowser attempts to scorch the brothers to death, but Invincible Mario and Invincible Luigi break through the fire breath with the help of Y/N's beam of light and strike Bowser, destroying his castle in the process. The group (including Mario, Y/N, and Luigi, in their normal state after the Super Star's effect wears off) crowds over a beaten Bowser who opens his eye.

"Y/N..." Bowser said softly and chuckled. "Uh, listen, this is not the way I pictured it, but give me one more chance."

"Sorry, B. But you need to be punished for your crimes." Y/N said before nodding to Peach.

"No-no-no-no-no--!"

Peach force-feeds Bowser a Mini Mushroom causing him to shrink; in a high-pitched voice.

"Hey! Hey! That is not cool!"

Toad grabs him by the tail and places him in a jar.

"Ha! He got the Blue Mushroom!" Donkey Kong laughed, nudging Luigi.

"See? Told ya I'd get you a pet turtle." Mario said with a smile.

This made Peach giggle.

"Not bad, mustache. And Luigi, you're so brave."

"Oh, thanks, uh, yeah, it's kind of my thing." Luigi said sheepishly.

Peach turns to Y/N.

"And Y/N, that was incredible thing you did back there. You truly are a legendary butterfly."

"Thanks. Still figuring out about the whole legend butterfly, but I'll take it." Y/N smiled.

Mario, Luigi, & Y/N's mother and father arrive.

"Ah, my children! My heroes!" Y/N's mother said, embracing her three children.

"Wahoo! Mario! You were amazing!" Y/N's father cheered and laughed.

This surprised Mario before smiling, feeling finally being praised by his father.

"Thanks, Dad."

Y/N's mother and father gasps to see their daughter in a what used to be a damaged wedding dress is now fixed thanks to the magic.

"My daughter! What's with the dress? It's beautiful, but what's going on??" her mother asked.

"Who're you married to? Where's that man? I just want to talk to him." her father said with a hint of threat of wanting to hurt the man that wants to marry Y/N.

Y/N gets embarrassed while Mario and Luigi gave her a look, "You better tell us once this is over".

"It's a long story. But I'm not married. Was about to, but I'm not even ready for that. No ring." she said, showing them she's not wearing a ring, much to her family's relief.

"Ah, good." Mario sighed in relief.

In the jar, Bowser grumbled to himself.

"Ah, bring it in!"

Donkey Kong pulls everyone for a back-breaking hug. Suddenly, the sound of applause sounds out. Everyone turns to see the entire populace, including Mario, Luigi, & Y/N's family, Francis, his owners, and even Spike cheering for Mario, Luigi, and Y/N.

"Let's hear it for the Super Mario Brothers! And legendary Y/N!!" Spike cheered, making Y/N cringe a bit to see him.

The populace continues to cheer the siblings on.

"These are my children!!" Y/N's father said proudly.

"Ha-hey!" Mario cheered.

"Wahoo!" Giuseppe hopped in the air with a cheer.

The siblings do their handshake before yelling out.

"Ay!"

Mario, Luigi, Y/N, Peach, Toad, and Donkey Kong strike a pose.

"Yes!" Toad cheered to the crowd.