Author's Note: Do you guys love the movie? I do, it's like one of my favorite Disney movies now :3 I couldn't help but think about what could have happened if Tadashi actually survived the explosion so I decided to make a fanfiction based on the movie with a little twist. No, I'm not changing the plot of the movie, well, I kinda am, it takes place about three years after Big Hero 6. Ugh, just read it and you'll know what I mean. So...it's like the big what if Tadashi didn't die but did at the same time he did in reality(wow I just confused myself..XD). I figured Hiro would have a love life sometime soon(just adding some small romance for more stuff to write with) so I made an OC for him to be paired with. Well, I hope you like it and if it gets a fair amount of views or reviews I'll continue it :)

Disclaimer: I do not own any of this, the characters, none of it. Well, except my OC but that's not the point of this note...

Chapter 1: Evil Villains

"There he is."

They were all crouched down, hiding behind a pillar as they watched their target. The old man, Casper, was currently tweaking with a weird machine, mumbling to himself. Basically he looked mad, his frazzled look and spiky smoked gray hair told you everything. Add the lab coat and wrinkles, he looked like a mad scientist/psychiatrist.

"What do we do?" Honey Lemon asked.

Hiro squinted and tried to take a closer look at the machine. "We should wait for the perfect opportunity then attack-"

"Attack!" Fred exclaimed, pouncing into the air before blasting a flamethrower everywhere.

Hiro had to stop himself from face palming and groaning. Of course Fred would just charge recklessly. The guy never seemed to get tired of his monster suit no matter how many times he propelled himself up in the air and shot flamethrowers everywhere. He charged toward the incoming robots that the old man had activated, taking them out one by one with his microbots.

"Hiro!" He dodged a blow. "Go after Casper!" Gogo commanded, while kicking a bot away.

Hiro nodded, and charged toward the man who was almost down with the machine. "Give up." He said, launching a pillar of microbots at the man.

Somehow the microbots didn't hit the stupid guy, and it made Hiro frustrated. The man laughed insanely, "Never! Once I activate this you all will be finished forever!" He cackled madly. "And there will be no more heroes for San Fransokyo to get in the way of my plans!"

"Hiro!" He glanced to his side to see Hikari Tsuyoki, beside him. "Got a plan?" She asked.

Now he should probably explain who Hikari was. She was a childhood friend, a fellow tech genius like him that just moved back from South Korwaii a year after Big Hero 6 was formed. She had light tan skin, bright blue eyes, and long straight black hair that reached her mid-back. Though she usually pulled her hair up in a high ponytail, and wore skinny jeans, black converse, and a navy blue/gray hoodie. Like Hiro, she had just graduated early and transferred to the institute of science. She specialized with hydro-technology and loved robots. She was kind of a tech nerd like him but she didn't seem to care at all.

She also helped out with the Big Hero 6. She wore armor similar to Gogo's, but it was a light blue mixed with black and navy blue, and instead of a helmet she had one of those futuristic lens that slid over her face and stayed attached like headphones, with tiny wings on both sides. She used her gloves to send out a invisible line of static controlled with a computer program. Sense static attracted water, she could use the static to maneuver water to her will, and turn it from solid to liquid with her tech. She also had a white, blue, and black hover-board, which was able to turn into a tiny portable box. All you had to do was press the button and toss it in the air and it transformed into a hover-board within seconds.

They added her to the team, not bothering to change the team name because they all did consider Hiro and Baymax as one package. He would never be Hiro the superhero, or even who he was today without his robot friend, and Baymax had been there for him when he needed it the most.

She was his best friend, and he kind of, sort of developed a crush on her over the past three years. How he wished that Tadashi was here to give him advice. Baymax didn't help at all, the last time Hikari had hugged him Baymax did a scan and stated that his neurotransmitter levels were elevated and the symptom was love. He was just glad that she was out of ear shot but when she gave him a funny look as he sheepishly stood in front of Baymax he knew she knew that something was up. He would never live it down if his feelings were conveyed by a fluffy nurse robot.

Hiro was about to say something but went against it. They didn't know exactly what the machine did see it would be hard to deactivate. "Nope!" They both jumped to the side, avoiding the explosion of one of the robots.

Hiro got so distracted that he never even noticed when the crazy guy flicked a switch on and a portal small portal can into existence, a bright green color. Hiro inwardly kicked himself for being so distracted that he had let the machine activate and dodged the robots, trying to get to the machine. Hiro punched the robot in the face, rolling over as another one tried to get him behind. With a flick of his wrist a sea of microbots dissembled the robot, and he plowed his way to the machine where the crazy old guy muttered to himself and frantically typed away on the keyboard.

"Hikari!" Wasabi shouted.

Hiro turned to where Hikari was and his eyes widened and she was getting cornered near the portal, and the old guy managed to sneak up on her after he had caught her close to disabling the machine. Hikari stood her ground, but she never noticed Casper sneak up behind her end push her in the portal.

"No!" He lunged for the portal, with the help of Baymax and managed to grab a hold of her before they both entered the bright light and he lost consciousness.

"Hirooo!"

Hiro woke up to a light nudge, and groaned. He squinted his eyes, to see worried blue eyes staring at him. He looked at his surroundings and realized that they were in the old warehouse, with no signs of destruction anywhere. Where were his friends? And also 'Crazy Casper' as Fred loved to call him.

Hikari sighed in relief, and hugged him tightly, "Thank goodness you're alright." He felt himself blush, and knew that if Baymax was here that robot would take any opportunity to scan him and innocently say that his hormone and neurotransmitter levels were elevated.

He leaned into the hug anyway, and ignored the prickling pain from his injuries. "Same to you." They parted awkwardly, and he furrowed his eyebrows. "Where are we? Where's Casper? Did the portal do anything?" He asked.

Hikari looked stumped, "I have no clue, this seems like the same area that we fought, but there's no debris anywhere. It's like it never happened." She shrugged, but looked like she was hiding something. Hiding something big, she only looked like that when she felt guilty.

The black haired teen frowned, "Like it never happened?" He paused, "Hikari, what are you hiding?"

She flinched and clutched a flyer in her hand, "Just...just look at this flyer and you'll get why I'm so worried and confused." She handed him the flyer reluctantly.

Hiro cautiously took the flyer, and flattened the crumpled paper and he froze. The science convention, and the date... Hiro stared at it in shock, that wasn't possible, that was three years ago unless-

He fingered the flyer, his fingers hovering over the date. Time travel?

He must have spoken out loud because Hikari shook her head, "No, not time travel." She took out another paper, "I managed to snag Casper's blueprints before he pushed me. After studying, it's actually dimensional travel." She frowned in frustration, "He never realized it, but once something happens in the past it creates a different dimension. We created a different dimension when we made a time ripple here." She explained.

His breathe hitched, "So you mean..." She nodded with a small smile on her face. "..we can save Tadashi?" He whispered in disbelief.

The blue-eyed girl laughed happily, "Isn't it great?" She asked.

He could actually save his brother in this timeline, although it wouldn't be his brother there was another Hiro in this timeline that would actually need him. He didn't want a younger version of himself live without Tadashi. He didn't want to do nothing while he could change something that could make his brother survive.

Hiro hardened his resolve, "We will save Tadashi, I may not have my brother anymore but..." It pained him to bring up Tadashi, but he made a promise to himself. "This timeline's Hiro Hamada needs his brother. At least the younger version of me in this dimension will get to keep his brother." His voice quivered.

She creased her eyebrows with worry, and gave him a brief hug before standing up, "Then we better start planning, right?" She asked, with a hand extended.

He accepted her hand, only to grunt in pain as he put pressure on his left ankle. "Did you break your ankle?" She asked worriedly.

He gave a strained smile from his spot on the ground, "Don't worry, I'll be fine. I'm a big boy now." He reassured.

She rolled her eyes and tossed him the blueprint from his spot on the ground, then threw a wad of clothes at his face that obscured his vision. "Just get changed, Hiro. You're lucky I always bring that emergency pack with me. Just rest, study the blueprint, and stay put. I put a protective barrier up already." He just then realized that she was in her regular clothes, not her armor. "I'll go find a place to stay, and then we can fix that ankle." She then finalized.

Seeing as she was determined, and when she was determined she would never give up, he agreed reluctantly. He didn't like feeling so helpless, but he knew he wouldn't hear the end of it until he rested and his ankle was fixed. Plus, he was practically useless if he couldn't walk on his own. If he refused, she would probably lecture him saying it was 'his fault for being careless in battle and getting injured' but in the end they always made up and he knew she was just worried about his recklessness.

Hiro sighed, "Fine, but you can't keep me cooped up in here forever." He warned teasingly.

She lightly slapped him in the head, "Right, and I have super powers that can make you stay still." She said sarcastically, but then paused thoughtfully. "Actually, I could make you stay still, you know, by freezing your behind to the ground." She said mischievously.

He grinned, "Ouch, Hikari," He held a hand up to his chest. "You wound me, I thought you loved me?" He gasped mockingly. He faintly blushed. Okay, so she might not know that he actually meant it but hey, he got points for saying it right?

She laughed, "Right, Hiro. I really love you." She replied back playfully, before exiting the warehouse.

He smiled dreamily, but then glanced back at the blueprint. Alright, he thought, his eyes tracing the mechanism on the page. Time to get you fixed.

Author's Note: Well should I continue the story? I'm not sure, so tell me what you think. Don't forgot to review when you can :)