Hiro's Prologue

"Baymax, destroy." Hiro's voice echoes in the room.

"My programming prevents me from injuring another human being." Baymax counters.

"Not anymore." Hiro pushes on Baymax's circular access panel.

"Hiro, this is not what-" Baymax stops talking as Hiro pulls out the nurse chip and tosses it away. Baymax's eyes turn blood red.

"Do it, Baymax. Destroy him." Hiro shouts. The room shakes down to a cold silence.

*dramatic music starts*

Baymax shoots a rocket fist at Callaghan, and misses. Baymax raises his rocket fist, and poises it to shoot again. Suddenly, GoGo smashes her body into the rocket fist. Baymax shoots, and misses.

"Baymax! No Baymax" GoGo shouts.

Baymax stomps angrily after Callaghan, and the professor desperately crab-walks away.

Fred jumps onto Baymax, only to be thrown off and smashed against the wall.

"No! Stop! He's getting away!" Hiro shouts. Fred again is thrown off of Baymax, but this time lands on Hiro, who accidently losses the mask. Callaghan grabs it and puts it back on, using his microbots to escape.

Someone shouts as GoGo, Wasabi, and Fred all get into Baymax's way to try to stop them as a last resort. Instead, Baymax throws them all aside. Akari looks around frantically with Honey Lemon, looking for a way to stop Baymax. She spots the chip that Hiro had tossed away earlier.

Baymax zooms in on Callaghan, and aims his rocket fist. Right before Baymax shoots, Akari quickly shoves the health chip back into his access port. Baymax slowly lowers his raised fist. Everyone slumps to the ground, sighing in relief.

*dramatic music ends*

"My health-care protocol has been violated." Baymax helps Fred up. "I regret any kind of distress I may have caused." Baymax states.

"How could you do that!? I had him!" Hiro shouts as loud as he can, his eyes burning with tears.

"What you just did, we never signed up for." Wasabi growls at Hiro.

"We said, we'd catch the guy. That's it." GoGo hisses.

"I never should've let you help me!" Hiro yells angrily, tears falling down his face.

"Hiro, they did it so that-" Akari starts, but Hiro cuts her off mid-sentence.

"I don't want to hear your excuses!" At that, Hiro turns to Baymax. "Baymax, find Callaghan." Baymax's scanner blinks red and glitches around in an odd way.

"My enhanced scanner has been damaged," Baymax replies, looking back at Hiro.

Hiro grumbles, climbing onto Baymax. "Wings!" Hiro hitches up Baymax.

"Hiro," Fred says. "This isn't part of the plan!"

"Fly!" Baymax shoots upward and Hiro ignores all protests from his friends.

"Hiro!" Honey Lemon shouts, but Hiro keeps on going.

He flies off back to the cafe, into his garage, where he begins to fix Baymax's scanner. He mutters curses under his breath.

"I thought you guys were my friends, my family. But you all betrayed me. So you'll pay. You'll all pay. Every. Last. One. of you," Hiro says to himself, menace and venom in every word.

(Four months later)

After Callaghan is caught, Hiro forgets what he said he'll do to the team, but then things remind him why he said those things and what he must do.

About a month ago, Callaghan, after being in jail for three months, was released because Abigail (Callaghan's 27 year old daughter) needed him back after two years of being in an alternate universe. She somehow got him out, even after all of his crimes. At the same, Hiro finds out on the News that a girl who was a daughter of Tony Stark was killed in the same fire that killed Tadashi. When they show a picture of the girl, Hiro recognized her immediately. Before he and Akari presented their microbots, Cole Stark went up to them and introduced herself to the three siblings. She gave Hiro her number and managed to let Hiro give her his phone real quick picture so that he could see that it wasn't a guy that was texting him since she was trying to go to SFIT too.

Hiro almost lost his sanity when he found out that Cole was killed in that fire too. First they let out a murderer of one person and destroyer of an entire building, a voice said in his head, and then you find out that the murderer really killed two people you cared about. The voice encouraged Hiro's darker side to show. You know what has to be done Hiro. Revenge!

(a few days later)

"Hey, Hiro! I'm so glad you got over all that bro," Akari calls out, waving. Hiro plasters a fake smile on his face and waves back. Oh, Akari, I love you so much little sis. And that's why it's going to hurt to do this, Hiro thinks.

"Of course!" Hiro links arms with Akari as they stroll through the park, the people within it slowly emptying. And once that last trickle of people left, there's no going back.

"Akari, you know how much I loved Tadashi," and Cole he thinks, "So you must understand me," Hiro says, gripping Akari's hand.

"W-What do you mean Hiro-" Akari catches that last moment of glinting determination in Hiro's eyes. That's the last thing she sees before everything around her disappears into blackness.

Hiro carefully places the neurotransmitter tick onto his twin's head, and watches as it burrows painlessly into her, ready to attach onto her brain.

"I'm sorry," Hiro whispers, "but I need to do this for Tadashi and Cole's sake." Hiro sighs, and carries Akari to a nearby park bench and lays her down, sitting next to her limp body. "You'll wake up in an hour. But as for now, you can just stay here with me." He kisses her forehead lightly, and whispers to no one in particular;

"1 down, 4 to go."

Hiro had no trouble doing the same to the team, except for, of course, GoGo. Geez, that girl put up a fight. It took nearly an hour to even get her knocked out enough for Hiro to plant the neurotransmitter tick. Hiro finally managed to get to the next part of his plan rolling: controlling them. Quite an easy thing to do, though. He had taken the same formula as his microbots, and tweaked it a little to fix his new invention. He had created a neurocranial transmitter, so he could now control the team. Now, Hiro thought, time to fix Baymax.

Baymax was easy. All he had to do was pull out his nursing chip, and tweak his other chip a bit so Baymax would listen to his orders and not kill anything and everything in sight. Back in his garage, Hiro places the green chip in a drawer. He draws himself away from the temptation of snapping it.

"No. This is the only thing left of Tadashi," Hiro whispers to himself. "I must keep it."

"Hiro?" A voice shyly asks. Hiro jumps, as he wasn't expecting anyone to see him. He turns. His twin sister stands at the doorway, but not alone. Peeking out slightly from behind her frame is a tall, young man and a slightly younger girl. The man was 19 or so, with black hair covered mostly by a cap while the girl was about 14 with longish black hair. Hiro's eyes grow wide. But Hiro notices something a bit off about the two new comers. The man's cap is askew to the side and the girl seems skinnier. Hiro dismisses that out of his mind, as he hadn't seen the man or girl in a long time.

"T-Tadashi? Cole?" Hiro stares at the man and girl, and the man nods slightly with a fake smile on his face. "Where have you two been?! We all thought you were dead!" Hiro runs up and hugs Tadashi and Cole, tears stinging his eyes.

"Hiro, we need you to do us a favor," Tadashi says, ruffling Hiro's raven hair. Akari stands there, smiling.

"Anything for you two," Hiro replies.

"We need the blueprints for your microbots and the neurotransmitter." Cole asks. Hiro pulls away from the hug, and digs through his drawers. Akari had left, silently. As Hiro turns around, about to give Tadashi and Cole the blueprints, he sees Tadashi and Cole. Yes, that was expected. But what he had not expected to see was Tadashi fixing his hair. Fixing his wig. Hiro catches a glimpse of blonde hair and also noticed that Cole's eyes were blue, but the REAL Cole's eyes were a fiery orange. Furiously, he shoves his blueprints back in the drawer.

"Y-You're.. You're not Tadashi OR Cole!" Hiro's voice echoes around the garage. He clenches his hands into fists, and slowly stomps over to the imposter. "You dare to pretend to be my brother or friend? My best friends? My idol?" Hiro swings his fists at the two imposters until the fakers runs off into the darkness.

Hiro's eyes turn dark, and he looks down.

"Nobody messes with my brother or friend. Ever. Now, you will all pay for this."

Hiro smiles a menacing grin, and starts to crave the rush of hurting someone. He catches up with the two imposters and starts to beat them up. Bright blossoms of crimson spilling over their skin. Black and blue, ink colored bruises decorating them. The sounds of them begging for mercy.

I don't want to be a hero anymore, Hiro thinks. Why be a hero when you can just be a villain?

A/N

This story is based on the AU Hiro Hamada's Dark Path, Kiki Anderson's Hiro and Akari stories, EclipseHeart185's parts Cole and the Twin Geniuses story and parts of New Heroes of Camp Half-Blood story. This AU is full of Death, Hurt, Loss, Love, Danger, Secrets, Returns, and much more! Please tell me how I'm doing, this is my first story!

**Disclaimer** I don't own "Hiro Hamada's Dark Path", Kiki Anderson's OC Akari, EclipseHeart185's OCs in "Cole and the Twin Geniuses", "New Heroes of Camp Half-Blood", and "The Return", Big Hero 6, Marvel, Inside Out, Incredibles, Bolt, Meet the Robinsons, and Rick Rordain's Books. BUT, I do own some of the OCs and the plot line of this story. If there is anything I forgot to mention please tell me, because I lost count of how many crossovers there are in this XD!

Eclipse: Wow, that's a really big disclaimer…

Ash: Ladies and gentlemen, she-wolves and wolves, and mortals and demigods of all ages, EclipseHeart185 everybody!

Eclipse: Thank you Ash, but just call me Eclipse for short.

Ash: Okay! Anything you'd like to say to the readers?

Eclipse: Follow, Favorite, and Comment this story and AshPhoenix284 everyone!

Ash: Aww, Thank you Eclipse! (To the readers) See you guys later!

~ Ash Phoenix 284