Author's Note: Hey, it's my first Big Hero 6 fanfic! This first chapter is admittedly not my best work, but it's really more for setting things up than anything. I know I haven't really been consistent when it comes to updates, but I really like this idea, so I'll probably be better. Alive!Tadashi, because I'm in denial (much like the rest of the fandom.) Enjoy!

Normally, the members of the recently named Big Hero 6 wouldn't need to venture into a hospital. After all, with their own personal healthcare companion, who needed doctors? Baymax could handle any injuries they acquired for no charge whatsoever. But, today was different. They weren't going for themselves, but for Abigail Callaghan. She had requested that they come to visit and explain everything that her father had done. After all, they were the ones who had experienced it first-hand.

Hiro looked around with a sigh as they walked in the door. He'd never been very fond of hospitals, with the strong smells and the possibility that someone in the building just died. But with his new friends at his side, he could handle it. Hopefully.

"Excuse us, what room is Abigail Callaghan staying in?" Honey Lemon asked the exhausted looking woman sitting behind the front desk.

"Room 510." She replied, not even looking up from her crossword puzzle.

"Thanks." GoGo smiled, blowing a bubble with her gum and popping it. They started up the stairs quickly, since they wouldn't all fit in the elevator. Hiro lagged behind a little, looking down at the ground. In the past, when he'd gone to visit someone in the hospital, he'd held Tadashi's hand. Just the knowledge that his brother was there by his side was always comforting. But now, he couldn't have that comfort ever again. Without even thinking about it, he instinctively reached out his hand, and to his surprise, felt someone take it. He glanced up to see Baymax looking down at him. He smiled softly, and was sure that if the robot had a mouth, he'd be smiling back.

They reached room 510 fairly quickly, and Abigail waved at the team.

"Hey, guys. Thanks for coming."

"No problemo." Fred replied, leaning against the door frame in a way that he thought looked cool, but was more ridiculous than anything. GoGo rolled her eyes, popping her gum again.

"Anyway, shall we get to it?" Wasabi asked.

"The sooner the better, I guess." The young woman sighed. She wasn't exactly looking forward to hearing what horrible things her own father had done, but she figured it was best to just get it over with. Like ripping off a band-aid. Suddenly, they heard a commotion in the hall.

"The patient's waking up!" An excited nurse called out. Two more nurses and a doctor ran past the door.

"What are they so psyched about?" Fred asked, looking down the hallway.

"There's an unidentified patient down the hall. He's been in a coma, but by the sound of it, he won't be for much longer." Abigail replied.

"How long has he been in here?" Hiro asked.

"A few weeks, I think. He's in pretty bad shape."

"Do you think Baymax should check him out to see if he's alright? He can work faster than the doctors."

"That might be a good idea." She nodded.

"I'll take him." GoGo offered. Hiro opened his mouth to object, but she quickly added: "You were the one who found Callaghan in that warehouse, so you need to stay and help explain." Hiro let out a sigh, not thrilled about the thought of being separated from his best friend, especially in this place.

"I guess you're right..."

"We'll be right back." She gave a soft, comforting smile. Tadashi had told her about Hiro's fear of hospitals a few months back, and she could tell how uncomfortable he was. Normally, she'd just roll her eyes and tell him to woman up, but he was a kid. Besides, she'd grown a bit of a soft spot for him.

"Alright..." He said quietly. With that, GoGo turned on her heel and led Baymax out of the room.

"Anyway, back to the matter at hand." Wasabi said. "Hiro, do you want to talk first?"

"Okay, I guess. Where should I start?"

"It's up to you." Honey smiled.

"Well, it all kinda started at the showcase, where I showed everyone my microbots. I guess your father saw the potential in them, so he took them and...and started the fire..." His voice got quiet, and the others immediately regretted asking him to explain first. He tried not to think about his brother, and instead kept his mind on the rest of the story. "Anyway, I still had one of the microbots, and it kept trying to go towards the warehouse where he was building more of them. At first, I thought it was just broken, but Baymax followed it and I chased after him, and we found your father in there. Once he realized we had seen what he was doing, he attacked us with the microbots, but we were able to get away. And then the next time we saw him-" His story was interrupted by the door flying open. Everyone turned their heads to see GoGo standing in the doorway; her eyes wide in shock, confusion, and a little relief.

"You guys aren't going to believe this." She said quickly. "I can barely believe it myself, and I was there! I saw him. He was there, and it was him, but I don't know how, or why, or-"

"GoGo!" Wasabi interrupted her. He'd never seen her flustered like this before. None of them had. "Slow down. What happened? Who are you talking about?"

"The 'mystery patient.' I saw him. Baymax saw him, too. He was in really bad shape, but I'd still know his face anywhere." She rambled; her eyes glued to the floor.

"Well, who was it?" Fred asked. GoGo looked up at the group, still in shock, and after a short pause, she answered:

"It was Tadashi."