Author's Note: Hi! This is my first Big Hero 6 fanfiction. Here are some disclaimers: I DO NOT own this story or these characters.

Disney, if you happen to read this, I know that this franchise belongs to you. Please don't sue me. This is, in my opinion, the best action movie Disney has ever made. This story is solely written as an AU.

That being said, I'm not going to write what happens in the movie word-for-word, because hopefully everyone has seen the movie before reading this. If you haven't seen the movie, then I highly recommend doing so before reading this story.

Enjoy! Hope you all like it.

Tadashi, Hiro, Aunt Cass, Honey Lemon, GoGo, Fred, and Wasabi found themselves in what appeared to be a movie theater. Tadashi felt himself panicking. Callaghan was still in the burning building! Hiro was bewildered and surprised. Aunt Cass and the others didn't know what just happened.

The big screen turned on and words appeared on the screen. Fred felt the need to read the message, as if he was the only person in the room who knew how to read.

"It says, 'Welcome. My name is Fate. I know the past, present, and future. I have brought you all here to make you aware of a future the Universe wants to prevent. You are here to witness the future that would have unfolded had I not brought you here," Fred read aloud. "Oh, so cool!"

"Might as well watch what he wants to show us," GoGo said, nonchalantly. "I don't see anything wrong with it."

Aunt Cass spoke up. "I don't think seeing the future is a good idea…" Her tone was uncertain.

"I think I know the gist of why we're here," Hiro said, a note of somberness in his tone. "We should stay."

"But Callaghan is still inside the SFIT building-" Tadashi said.

"Not to worry, Tadashi," Fate reassured. "Your time has paused. It will not resume until you leave."

"Wait, what?" Wasabi jumped. "An SFIT building is on fire?!"

"Rest assured, no one's been hurt in the fire, Wasabi. I give you my word," Fate said.

"In that case, I agree with Hiro and GoGo," Wasabi tone relaxed.

Tadashi sighed. "Okay." He turned to Aunt Cass. "What do you think?"

"I'm okay with it," Aunt Cass said. "If it's important, then I think we should take Fate's word for it."

"I think we're all in agreement?" Hiro acknowledged everyone in the room. No one protested. Hiro turned to the TV screen. "Fate, show us what you have to show us."

"This is where time left off before I brought you here," Fate said.

Tadashi and Hiro ran towards the SFIT building that was on fire. A girl ran out and told them that Callaghan is still inside the building that is currently burning. Tadashi sprinted towards the building. Hiro held him back by grabbing his arm.

"Tadashi, no!" Hiro protested.

Tadashi looked at the building and back at Hiro. "Callaghan's still in there. Someone has to help!" Tadashi broke free of Hiro's grip. Hiro picked up Tadashi's hat that fell on the ground. Hiro was about to run after his brother until he flew back from a blast that knocked him off his feet. The building was consumed by a raging fire, making it impossible for a human being to survive. Hero screamed his brother's name.

Tadashi felt extremely stupid and guilty. He felt stupid, because he got himself killed by trying to be a hero. He felt guilty, because he caused the people he loves so much grief. If he weren't here now, he'd be dead.

Everyone else had tears in their eyes. Hiro sat next to his brother and glared at him. Tadashi looked at his brother with an apologetic expression. Hiro's anger seemed to decrease as a result.

"What. On. Earth. Were. You. Thinking?" Aunt Cass drawled out each word. "Never be a hero in emergency situations like that!"

"I couldn't just let a man die, much less my professor who's been a mentor to me," Tadashi defended himself.

"I don't care. Callaghan is a grown man. You are a young man with your whole life ahead of you. You mean more to me than Callaghan," Aunt Cass said.

Hiro couldn't help thinking that her words were a little cold, but he agreed with her. If he had to choose between Callaghan or his brother, he would choose his brother. Tadashi and Aunt Cass are all that's left of his family.

The next scene shows Hiro sitting in his room, looking dejected and withdrawn. Aunt Cass came in, trying to get him to smile by telling him a funny story. Aunt Cass tells him that SFIT said that he could still register for the semester. As Aunt Cass leaves, Hiro throws the letter in the trash.

Tadashi looked at the screen, his heart filled with worry for his brother. Hiro wanted to go to SFIT more than anything. Now Hiro was too upset to leave his room. Tadashi looked at Hiro sitting next to him. Hiro looked a little guilty about being unable to get over his depression. Tadashi let his instincts do the talking and put a hand on Hiro's shoulder. Hiro looked up at him with a curious expression on his face. Tadashi gave him a reassuring half-smile.

"I'm not going anywhere. I promise you," Tadashi told Hiro.

"Good," Hiro said, feeling better.

Hiro picks up an action figure and the bottom part of it falls on his foot. Hiro grabbed his foot and groaned, "Ow!"

Baymax activated himself and slowly walked towards Hiro.