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Professional Bot Fighters

Summary:

Young Hiro Hamada discovers a way to combine dormant nanites - microscopic machines that have infected everything since the lab they were created in exploded five years ago - with controlled robots, creating nanobots. His nanobots were seemingly destroyed, though, in the same fire that killed his brother.

Rex gets called in when Providence picks up EVO-level nanite readings in San Fransokyo, but it turns out it's not an EVO - it's professor Callaghan, the robotics professor who set the fire to steal Hiro's nanobots.

(Started out as a drabble, turned into something longer.)

Chapter 1

Notes:

A couple things first. One, the timeline ended up a bit different in this crossover. I'm chalking it up to things having played out differently in the crossover universe. Two, these first two chapters have a pretty different tone from the rest of the fic, because they started out as drabbles that I decided I needed to add on to. I might rewrite them in the future but for now I want to write the whole story first.

This starts just after Hiro has ditched the rest of the team on the island, and has failed to chase down Callaghan on his own - and sometime mid-season 2 of Generator Rex (let's say after 13 'Night Falls' but before 15 'A Family Holiday').

Chapter Text

The call was for an EVO attack, but when they got there it turned out there was no EVO. Just a kid in a purple suit with a look in his eye that was ready to kill.

Rex had seen that look before. “Hey kid, you OK?” he called out as he landed on the dark pier. He thought he was being ignored for a minute, but the kid finally huffed a sigh.

“He got away,” the kid said. He was staring out into the blackness of the ocean at night.

“Who got away?” This time he was being ignored. The kid turned from his spot on the pier and marched back toward the docks, pointedly ignoring the newcomer. Rex jogged to catch up, calling “wait up! What happened here? What’s your name?”

At the docks, a large robot decked out in red stood passively waiting. It turned at the sound of Rex’s voice.

“I am Baymax.”

Rex blinked up at it. It’s voice was surprisingly soothing for such an intimidating looking machine. “Wasn’t talking to you,” Rex said, “but hi anyways. I’m Rex.”

“Hello,” Baymax responded. A moment later the purple helmet of the kid’s suit appeared over the robot’s shoulder.

“Hey kid,” Rex started, but was interrupted before he could even finish his thought.

“Baymax,” the kid said loudly, authoritatively, “take us home.”

“No, wait,” Rex tried again, but it was too late. The robot shot up into the air in a millisecond, only visible in the dark by the light of his propulsion jets. Rex sighed, then braced himself as the nanites in his body shifted and changed until they formed his trusty turbine wings. He shot up into the air after them.

“Hey!” Rex yelled into the sky, gaining on the kid and his robot, but the wind was against him and they couldn’t hear. He pushed himself faster, until he was almost close enough to touch them. Sensing something there, the kid looked back, and his tired eyes widened in shock.

“How are you doing that?” he called back to Rex. His eyes slid from Rex’s face to the wings behind him, trying to comprehend.

“Nanites!” Rex called back. He couldn’t help the grin.

“You’re an EVO?”

“And I can cure EVOs too. Pull over so we can talk.”

They ended up resting on the top of the golden gate bridge, the nearby city lighting up their perch. As the kid climbed down off of his robot, Rex called his nanites back to their original state. He stood with a hand on his hip, the kid pulling off his helmet to look up at him in awe.

“The name’s Rex,” Rex said, not for the first time that night.

“Hiro,” Hiro finally answered. “How can you control the mutation?”

The question caught Rex a little off guard. “Uh, I don’t know, I just always have. I talk to the nanites, and they do what I say.”

Hiro’s jaw dropped open, and he clutched the helmet to his chest a little tighter. “You can control nanites?”

Rex scratched his scalp behind his goggles strap. “Well, yeah,” he started, wanting to steer the conversation towards whatever incident had alerted Providence in the first place, “but that’s-“

“You can help me take out Callaghan!” Hiro interrupted. He was smiling, but his eyes had turned dangerous again.

Rex didn’t like that look. He furrowed his brows. “Who’s Callaghan?”