Hiro opened the door to Aunt Cass's hospital room with a satchel around his shoulder.
"Hiro!" she exclaimed. "Where have you been?! Did you hear about the girl in North Korea? The world's on lockdown!"
Hiro hugged her. "I was in Germany."
Aunt Cass just looked shocked.
"I got this." Hiro pulled out the Golden Flower.
"My god, it's beautiful. What is it?"
Hiro took out a cup and a bottle of water. He poured the water into the cup and then crushed the flower into the water, dissolving it.
"Hiro, why would you do that? Is this some kind of joke?"
"Drink this." He handed her the solution.
"Wha-," she was cut off.
"Trust me."
She eyed Hiro for a few seconds, but then drank it.
"How do you feel?"
Her eyes brightened, and her skin smoothed.
"I feel amazing. Hiro, how did you get this?"
"My girlfriend and I sieged a government facility."
She spewed water out of her mouth.
"Are you insane?!"
"Talk to you later, love you!" Hiro quickly kissed his aunt on the cheek and left the room.
"Doctor!" He said pointing to Aunt Cass's room as he left the room. "She's healed! It's a miracle! Praise the lord!" Then he ran away from the confused doctor to his nerd lab to build a time machine.
"Hiro, for Christ's sake, not again. This is the third night! Get some sleep!" a worried GoGo said.
"I can't! I've already analogized the quantum fields, and I just need to utilize the exotic matter to stabilize the metric tensor in the Alcubierre drive, that is as soon as I can offset the energy density-"
"Hiro!"
Hiro looked at her with an agitated expression and a five o'clock shadow. He'd almost cracked it in just three days of work.
"You won't be any good on this mission if you're half asleep the entire time."
"Nothing will be if I don't finish this drive!"
"Okay, okay, try to explain how this thing is going to work, more intelligibly," GoGo ordered.
"Well," Hiro started without looking up from his contraption. "We'll put on suits that support space contortion in a quantum field, which means everything inside the suit will be safe while the space in front of it is contracting and behind it is expanding. This will be done by the Alcubierre drive that I'm engineering. And using a Casmir vacuum will fulfill the negative-energy requirement, which will allow the propulsion system to warp our spacetime. This virtually means that a wormhole only apparent to our consciousnesses will take us to a point in space and back faster than the speed of light, the distance of which determines exactly how far back in time we travel. Now, what I'm having trouble with is the math of the space contortion so that we can go to the exact point in time desired. Now as for returning, I'll have to get a particular distance with the right time dilation ratio so that a millennium can pass in seconds for our perception."
GoGo looked at him with wide eyes.
"So, pretty much we go faster than light by moving the space around us to go back in time, and then we temporarily go so far away that we freeze in relation to time on earth to return."
"How do you know this will work?"
Hiro just shrugged. And GoGo sighed. She pulled out her phone to check news, and her eyes immediately widened, making Hiro look concerned at her.
"What?" he asked.
"This 'chain killer' hijacked a plane… She's flying straight towards Japan."
Hiro simply kept working.
"What the hell? What beef does she have with this country?" she questioned. She decided to just leave a focused Hiro to work.
Every now and then Hiro's friends would come through and ask how his project is going. He would just say "good" and leave out the time machine part. He knew the mission would be easier with a lighter group. He would test the machine whenever the lab was empty, trying to send rats a few minutes back in time and then use time dilation to bring them back. After each trial and error, he'd amend his equations and compare results of another test to the equation, and repeat. And then on the fourth day he finally got it. The rat came back, and it was exactly 5π seconds older than it was 0.001 seconds ago. He could now tweak the variable for any desired time shift from any time in the past. He jumped up and down four times, then took out his phone and called GoGo.
"Mmhello?" GoGo answered sleepily.
"GoGo! I did it! Come to lab, quick!"
GoGo sat up. "Are you serious?"
"Super one-hundred percent whole grain cereal, yes! And bring Baymax!"
Within minutes, GoGo burst in with Baymax close behind.
"Let's see it!" GoGo said urgently.
"Baymax, open your chip interface."
He opened his interface, and Hiro slipped a chip in that said "time travel."
"Reading chip," Baymax said before refocusing his lenses. "Now downloading: Einstein-Rosen bridge equation, space contortion equation, Alcubierre drive interface, propulsion system interface, Casmir equation, wormhole variables, time dilation ratios. Now utilizing. Error: hardware update required."
"I'm on it buddy, I have to install the drive! Eject your carbon fiber skeleton." Hiro mounted the drive onto Baymax's skeleton and wired the system to Baymax's new processor.
"Utilization complete. I am now a time machine. Please equip the anti-contortion suits before traveling."
"Oh my god, Hiro!"
"Are you ready to go?!"
"Hiro, no, are you kidding me? Get some rest."
"GoGo, I've come too far. We have to go now!"
"Fine," GoGo said before leading him to couch. "Just lay down here for ten seconds, and we can go. I'll count for you."
"Okay," said Hiro.
"One, two, three, four, five, six, seven, eight, nine, ten. Goodnight, Hiro." GoGo kissed Hiro's forehead and fell asleep next to him.
"Hiro! Wake up! They're evacuating the city! We gotta go!" GoGo rushed him.
"What?!"
Without any more words, they collected everything they needed, put on their suits, and set off for the mountains in Switzerland faster than the speed of sound.
"We have arrived," Baymax said as they hovered immediately above the snow. "Ready for space contortion travel."
Hiro exhaled prominently.
"You nervous?" GoGo asked.
"Yeah," he said.
"Don't be. You're Hiro Hamada. I trust you more than you trust you. You're the smartest man on earth," GoGo reassured. Hiro smiled.
"Let's do this."
"Preparing Alcubierre drive. Activating propulsion system. Now commencing space contortion. Traveling back in time approximately six-hundred and forty-two years, three days, one hour, twenty-one minutes, and fifty-five point eight seconds."
The first thing they saw was the sky above them seeming to turn inside out. Then their prior location disappeared into a sphere below them. For a second, there was nothing but stars in the distance all around them. Finally the universe appeared to turn inside out, and the past engulfed them, causing the wormhole behind them to diminish. They were hundreds of feet in the air.
"Whew! Baymax take us down!" Hiro ordered.
"Woo!" GoGo yelled.
"The first time- journey tra- travel journey to the past was a success. Are you sati- fisfied with you care?" Baymax said.
"You need to charge, Baymax! Where's the tree?" Hiro asked.
"I detect the fruit over- is ov- over there- north- few miles- he are am satisfied with your care," Baymax finished and deflated. Hiro removed his futuristic gear and hid it in the charging suitcase Baymax.
"Let's go," GoGo said.