Hiro Hamada is just fourteen years old. He became a superhero at that age. When he enters his home, he had a bag full of microbots. His aunt, Cass Hamada is making Hiro some 4 pm snack.

"Aunt Cass, I'm home!" Hiro yelled.

"Are you home, Hiro?" Cass asked.

"I'm coming up right now."

Tadashi Hamada, Hiro's older brother is sleeping his head on the table.

"I'm cooking a 4 pm snack. I topped them with gummy bears. I tried to put peanuts on it, but you're mildly allergic to that."

"Yeah, well thanks!"

Mochi meowed.

"Not a problem, don't work too hard." Cass said. Mochi rubs against Hiro's leg. Cass patted on Tadashi's shoulder. "Hey, Tadashi, please get up! Your brother is home!"

"What? What am I dreaming about?" Tadashi woke up in surprise. "Was I dreaming about puberty?"

"You did not know that your brother's home."

"Hiro, you better watch out when you reach the top of the stairway." Tadashi yelled. "You will trip over that string."

Hiro reached the top of the stairway. He jumps over the string without falling down. He sits on his computer chair and eats his 4 pm snacks. Tadashi did the same thing when he goes upstairs.

"I know what you were going to say, Tadashi."

"I did not know who put that there." Tadashi said. "Baymax is downstairs at the front of the cafe. I would have to grab him real quick."

Tadashi is being cautious with the string that blocks through the stairway. Hiro starts eating his 4 pm snacks before going back downstairs. As soon as Hiro's done with his 4 pm snacks, he starts heading to the stairway to catch up with Cass.

"Cass, you can come upstairs, I'm done eating." Hiro said. "You always have to be sure-" He starts falling down stairs after tripping through the string. Cass widens her eyes. "Ow!"

Tadashi and Baymax are together. Baymax starts activating. "Huh? Baymax, what are you doing?"

Baymax walks upstairs. He waved his hands to Hiro. "Hello, I am Baymax, your personal healthcare companion. You have fallen."

"Baymax, you're still there." Hiro said.

"Are you sure you're okay? You seem to fall downstairs."

"Yeah, I'll be alright. I'm still already alright. I tripped over a string."

"I'll take care of that." Cass said.

Baymax heads downstairs to Tadashi. Cass has an empty plate of Hiro's 4 pm snack, and takes care of dishes. Hiro is holding microbot in a glass. He puts it back in his pocket. He runs his hands through his hair.

"Tadashi and I are going to meet by each other tomorrow. Hopefully, he doesn't die in the horrifying fire accident. I also don't want to die at fourteen."

"Oh, no, I don't want you to. Maybe in three hours, come back for dinner."

"Okay, I will. I will never forget." Hiro hears his microbots going bye-bye. His eyes widen, frozen at the straight pose, and looks at the stairway. "What are we having for dinner?" Hiro went back upstairs.

"We're going to have chicken wings tonight. Get ready to have your face melted in three hours." Cass turns around, and Hiro's gone.

Hiro looks at the microbots over his bedroom window. His eyes were widened, and he is a bit freaked. "You've got to be kidding me!" He went downstairs. "I have to go, Aunt Cass!"

"Don't take too long, Hiro!" Cass smiled.

Hiro looks at microbot inside of a glass, trying to go some places. Baymax holds it now.

"Your tiny robot is trying to go somewhere." Baymax said. He hands it to Tadashi.

"That means we have to find a location for Hiro's microbots." Tadashi said. "I will keep the track for his microbot; you carry Hiro, and follow me."

Baymax picks Hiro up. All left Lucky Cat Cafe.

While Tadashi is using a GPS to track microbots, Baymax is holding Hiro and following him on the street cautiously.

After the arrival at the abandoned warehouse, Baymax drops Hiro down. Hiro stood up straight. Tadashi hands microbot back to Hiro.

"We have found a location where Hiro's microbots are." Tadashi said. "They're at this warehouse. That place is locked."

"There is a window." Baymax said. "It's right up there." He points to the window.

"Who's going in there first?" Hiro said. "Baymax, you help us out."

"I will track on eeny, meeny, miny, moe standards." Baymax said. He is starting his eeny, meeny, miny, moe moment to Hiro and Tadashi. He points to Tadashi first. "Eeny, meeny, miny, moe, catch a tiger by the toe. If he hollers, let him go, eeny, meeny, miny, moe. Hiro it is!"

"I'll wait right here." Tadashi said.

Hiro is attempting to climb to the window on top of Baymax.

"Please exercise caution." Baymax said. "A fall from this height could lead to bodily harm."

Hiro holds his both hands at the window. "I'll get you in there, Baymax. TADASHI!"

"I'm coming!" Tadashi comes by. He hops, and then grabs Baymax's legs. "Are we ready, Hiro?"

"We'll go for it, Tadashi!" Hiro said. He reached and passes through the window. Baymax gets stuck.

"Oh, no..." Baymax said. "I cannot deflate, because Tadashi is hanging on me."

"Just...keep it down." Hiro said.

"That is just too cruel, Baymax." Tadashi said.

Hiro steps down the metal stairway. He saw a tank that is making microbots. He freaks out. He quietly steps up to the tank.

While he's doing it, Tadashi is helping Baymax.

"Can you really get in there, Baymax?" Tadashi said. "You're stuck through the window."

"Tadashi; is this what Hiro would want?"

"No, it doesn't matter. Just...deflate...please!"

"I cannot deflate until you let go off me."

"Get in there, Baymax! Try your best as you can!"

"Do you want me to contact Hiro?"

"No! Let him go, Baymax."

Hiro peeks through the tank. When the microbots are being made from the tank, he steps up closely. He picks some of them up. "My microbots are there?" He drops down his microbots. He saw a lot more. "Someone's making more." He runs his hand through his hair. When he hears Tadashi and Baymax, he is slightly scared. He screams. He froze off.

"Baymax, get in there!" Tadashi yelled. "If you don't get in there, my little brother will die!"

"I cannot let Hiro die." Baymax said. "Is this what you want?"

"Please get in there, fast!"

"I am not fast."

"You'd better be, Baymax! We're here as a team, do you remember?"

Hiro picks up microbot in a glass, when it starts moving. A swarm of microbots makes his eyes widen. He panics. "TADASHI!" He screamed. He is running to the locked door. More microbots are about to attack him. "You'd better get me out of here! I have nowhere to go!"

"Baymax, just get in there, please!" Tadashi said.

A man in kabuki mask is about to throw Baymax off. He is now controlling microbots.

"Hiro...?" Baymax said. He covers himself while the microbots are going to push him off the warehouse window. Tadashi is yelling. Baymax is holding Tadashi as well as jumping off the window.

"Who was that?" Tadashi asked.

Baymax is showing a man in a mask to Tadashi over his belly screen. "His blood type is AB-. He is a man in a mask."

"We have to get out of here!" Tadashi said.

"We can't leave Hiro unattended." Baymax said.

"I don't care, but we have to hurry up and see police officer!" Tadashi grabs Baymax's hands, and runs to the police station fast.

Hiro is trapped inside of a warehouse. He returns back to the spot where he started before. More microbots are coming out. "Oh, I can't stand being in here." He cried.

Tadashi and Baymax are at the police station.

"Alright, let me get this straight. A man in kabuki mask has escaped again. You tried to get in that place, but you were blocked from balloon-man."

"My little brother is trapped inside of a warehouse." Tadashi said. "He has nowhere to escape."

"So, your younger brother is trapped inside of a warehouse, is Mr. Kabuki trying to attack him?"

"I never saw that, because my creation was stuck through the window, and he won't go inside of a warehouse. That man stole all Hiro's microbots."

"Okay, well I get that. We'll find him as soon as we get there. If not, I'll let you know who to call."

Baymax takes the tape. When he inflates his arm, three holes pop out off the air, and put the tape one-by-one. Another arm happens to be the same thing. Police officer is obsessed.

"Thank you, officer!" Tadashi said.

"You're all set."

Tadashi and Baymax left the police station.

Hiro is running around the warehouse, being chased by microbots. He slams through the door that is locked by trying to escape. He gasps, and looks back. He moves to the left. He tries to block the microbots away by locking it in, but the microbots slammed him down under. He tries to hide under, but more of them are coming down. He went back on the ground. "TADASHI! BAYMAX, you better get me out of here!" He cried.

Hiro gets trapped by tons of microbots, and being thrown to the window. Microbots are acting very pointy right now. The first shot pokes through Hiro's chest and back, and then goes through his back of his head. He gets thrown out the window. Hiro is screaming, splattering blood all over the line.

"Unbelievable!" Tadashi said. "Hiro, where are you?"

Hiro is having coughing fit. "Tadashi."

"Baymax, Hiro is shot. We have to take him home."

They left the warehouse by hurrying up.