Warnings: Time travel/Parallel universe fic.

Disclaimer: I don't own Big Hero 6. It belongs to Disney and Marvel. If I did own it, Tadashi would have lived longer than 23 minutes.

Chapter 1: Time

Tadashi sat on his bed, staring into nothing. He didn't want to look up. All the robots standing on the shelves and his brother's side of the room would be seen if he did. If he saw them, his heart would crack, breaking under the feelings of despair and sadness. They would remind him that his brother, Hiro, was dead and he wouldn't be able to bear it.

Tadashi blamed himself for his brother's death. Had he not tried to make him go to Nerd school, maybe the fourteen year old would still be with him. The college student shook his head at those thoughts. Tears started to form. He was so helpless that day. He couldn't save Hiro at all. Tadashi did his best to try and help as many people as possible, yet he couldn't do the same his brother.

Helplessness. Incompetence. Those were the words the brunet hated.

Tadashi didn't want to be anything like that. His brother was gifted. Sadly, Tadashi wasn't nearly as intelligent as Hiro was. While he was a straight A student, he got there with much more difficulty than Hiro did. That boy could invent time travel had it caught his attention…Time travel. How Tadashi wished he had that kind of power. He wished he could control fate, maybe then Hiro might not have disappeared from his life.

The college student could remember that day so easily. It had been haunting him for three weeks. On the day of the convention, Hiro had earned his way into college with his microbots. Tadashi was so happy for him. The lights in the building weren't nearly as bright as he, his brother and his friends' joyful faces lit the entire hall. Everyone was smiling, laughing, congratulating, proud of the small fourteen year old. Tadashi started imagining how great his brother was going to do in college and the amazing things he could do, even picturing them in the same class made him unbelievably excited. Tadashi and Hiro would learn so much together…together…

But that was never going to happen. Tadashi started to cry, his hands trying to wipe the never-ending tears from his eyes. It wasn't long after they started celebrating that the hall was suddenly on fire with everyone still inside. People rushed out, trying to get away from the rapidly growing flames. Tadashi and his group did the same. He held Hiro's hand as they ran, guiding him to the exit, to safety. His younger brother struggled to keep up with him. Those short legs could only move so fast with the longer ones.

Confusion. Desperation. Fear. Those were the painful emotions everyone felt at the time, but they would eventually morph into something different in Tadashi.

The flames had completely consumed the showcase hall. Fire burned everything as the debris started to fall. Tadashi was running and focusing on the exit so much that he didn't notice the large rubble falling above. Hiro did. He smaller boy let go of his brother's hand because of it, letting Tadashi's grasp slip and make him fall away from the fallen concrete. He landed on the hot floor harshly, getting a scrape on his right shoulder.

When he got up, he couldn't see Hiro. Was he trapped in the debris? Or was he behind it? He hoped it was the latter and tried to move the heavy material away trying to find his precious younger brother. He could barely move any of them, but the panic and desire to save Hiro made the adrenaline give him strength. He couldn't focus on anything else. He couldn't see the flames or hear his friends screaming at him to leave. His mind was solely on saving his brother. He had lost too many family members already. Tadashi didn't think he could bear losing another.

He was pulled out of his thoughts when Gogo and Wasabi started dragging him to the exit. Tadashi struggled against them, calling Hiro's name, but he wasn't strong enough to escape their grasp. Only seconds after they got out, there was an explosion and the flames blazed with intense and destructive heat. No one could get inside now. There was no way Hiro could have survived.

Tadashi stared at the burning building.

Powerless. Weak. That was what he was.

After anxiously waiting for days, desperately hoping Hiro would return, Tadashi was told that they found Hiro dead under the rubble he was so urgently trying to remove. His hope had been crushed to a thousand pieces and painful emotions replaced the constricting grasp on his heart. It became a pang that twisted his heart so hard he was barely breathing. He wished the debris had protected his brother instead of crushing him to death, but his mind gave his heart a thought eased the pain ever so slightly.

'At least Hiro didn't die a painful death. At least he was spared from the tortures of the flames.'

He couldn't tell if that was a happy or dim thought, but it made it a little easier to breathe. His friends helped as well. The company of people he loved really made it better. They would visit him as often as they could and try to get him to do something or talk to him, giving advice or saying something amusing to make him feel better. They even sent him a cute video where Fred made a funny superhero comment. He would let out a small smile at their actions. They really cared for him and he loved them for it. He could never blame them for making him leave Hiro. They were just trying to protect him and there was nothing he could do. There just wasn't enough time.

Time. That was a horrible word to Tadashi's ears.

He felt like he had in despair forever and it wouldn't go away. He just didn't have enough time to save Hiro. Tadashi had could no longer spend time with his baby brother. Hiro, poor Hiro, no longer had any time to live, to be happy, to be with him. He was too young to be given such a fate. It wasn't fair. Nothing was fair. Time wasn't fair at all.

Tadashi shook his head, trying to get rid of the thoughts, and looked up. He saw his brother's side of the room. Hiro's robots, his computer, his bed, his books were all still there. Hiro. Hiro. Hiro. He turned away. It all reminded Tadashi of his little brother and it was tearing him apart. 'Damn it. I can't stay like this forever.'

He looked back and the pang returned as powerful as ever. Tadashi sighed grimly and looked down, his expression pained.

"Unbelievable…"

A teen in black clothing with indigo and red armor stared down from the high cliff, a hand resting on his matching metal belt pouch, multiple buttons waiting to be touched. Everything was destroyed, turned to dust and leaving a desolate waste land. He watched the wind through the visor of his black helmet as it carried the black dust away, the teen's black memory stick necklace swinging with it. The sunset, though nearly gone, could still bring out the loneliness and barrenness of this apocalyptic world.

The teen sighed. To think this place was the bright city of San Fransokyo just four years ago. He could still remember the lights and the people of that place, the memories being both bad and good. They were gone now. He would never see the balloons fly in the sky or his friends ever again. He would never see the brimming city lights or his family.

Loneliness. Isolation. The teen hated those feelings. He had hoped he would never feel them again, but fate wasn't going to allow it.

He kicked a rock off the cliff with his black steel-toe sneaker. It was a long way down. Trailing the barren wasteland, the teen saw the black mountain in the distance. It was the place where his current enemy was. There, that demon was likely building up his army after he destroyed most of them from the last attack. However he was making them, it had to be bad to turn a whole mountain black.

The armored young man looked behind him to the last of the human race. There were around one hundred and forty-two million survivors that had gathered from all over the world. He had managed to build them a dome with force fields to protect them, to grow food and build homes. He had appointed a leader to them and gave them plans for the future for when he destroyed the enemy or if he died. The people didn't want him to fight alone, they worried about their hero, but he refused. He had lost too many comrades already and he couldn't bear to grieve again. They understood. Everyone on this earth was broken from loss and suffering, but his sacrifice would hurt nonetheless.

Hopeless. Sorrow. Everyone in this desolate earth felt it, even the hero, but he at least figured out how to help everyone move on and live again.

Now, after making sure everyone would be okay without him, the young hero knew it was time to take down his adversary. The people were still in danger as long as that fiend was around and he needed to avenge his family and friends. With those thoughts in mind and the weight of millions of people on his shoulders, he stepped off the edge.

As he fell, he activated his suit, deep blue lights moving all over his body. Black electro-magnetic wheels formed and rested on his hands and ankles like shields. The lone hero flipped and started riding down the vertical cliff, leaving a trudge on the rock. Ten feet from the ground, he jumped and landed with ease. He started to haste his way to the black mountain with incredible speed.

It wasn't long before he reached the base, where robotic soldiers started to attack, energy beams flying in the teen's direction. However, with his visor, the fast electro-magnetic wheels and a quick mind, he easily dodged the attacks. He activated another weapon. His wheels weren't going to be strong enough to destroy these obstacles. The metal was just too hard.

Laser induced plasma blades formed and he wasted no time slicing any machine in his way as more and more kept coming, marching down the mountain like ants while arming themselves with steel swords and shooting beams. With every destroyed soldier, they exploded, much to his satisfaction. He wasn't going to let these things exist and risk being remade by someone else. He spun, slashed, kicked and destroyed the robots. It hadn't even been an hour when he had completely destroyed every robot outside.

Though he wrecked every single one with a straight face and a sensible reason, he would be lying if he said that he didn't hate these things. They were the weapons that killed his friends, so naturally, there was resentment. However, he knew deep down that it wasn't their fault. They had no emotions or choices. Deep down, behind the wall of hatred and pity, his hated for his adversary grew in the shadows.

Slicing the last robot and avoiding the explosion, the teen made his way up the mountain to a cave, avoiding a toxic, silver liquid. It put shivers down his spine, but he tried not to think about it. He glared at the entrance into the mountain and ran, his black electro wheels speeding him up to the top. Avoiding the perking rocks, he reached the entrance with impeccable swiftness. His eyes held a cool stare as he entered the mountain, taking in the sight.

There was no sign of the natural rock anywhere. The walls had been completely covered by metal and it had an even cooler chill compared to the outside. The shine of silver and the cold air made him briefly think of ice, but it soon vanished when he decided ice was much prettier than this metal cave. Lights trailed the roof in a straight line as if from a mine, but the young hero knew there were no jewels in this place.

He turned his gaze to the sides of the hall. The cracks made were very suspicious. The young hero's eyes narrowed and got into position, ready to race down the passage. Blasting off, he zoomed down the hall, dodging the suddenly appearing robots that emerged through the wall violently, trying to stop him. They couldn't catch him. The hero was too fast, but that didn't stop them from chasing him.

Turning and turning and racing, the indigo teen finally saw a panel and an open door. Pushing himself to go faster, he reached the panel and pressed the correct sequence of buttons before racing through the passage as the door slammed behind him. He heard the machines crash before an explosion occurred on the other side, making the hero flinch and turn away, dashing once again.

The indigo hero stopped when he saw more bizarre cracks.

"Argh, I can't take much more of these things," he said to himself, groaning in irritation. He had destroyed so many already. Just how many more were there?

Looking around, the teen searched for a new way around, hoping to avoid triggering the robots hiding in the walls. He groaned to himself as he realized something he should have done earlier. He pressed some buttons on his metal pouch and an orb emerged. The young hero threw it to the floor and watched as thick ice filled the corridor, freezing everything behind the walls in place.

"I can't believe I didn't do that earlier. I guess adrenaline is a double-edged sword," he scolded himself, walking on. It was smooth sailing from there, nothing came to try and stop him, though he did have to throw a new orb every time he needed to turn a corner. After careful walking and many turns, the young hero found what he was looking for: his nemesis…

Seishin, the spirit of despair. Or at least that's what everyone called him.

Loathing. Concern. Anger. Dread. Those were the feelings that grasped the indigo hero's heart once he saw the fiend.

But of course, this was no fiend. In the spherical room, stood a man. Seishin was much taller than the young hero, which always made the indigo boy jealous. He seemed much stronger than the young hero with large muscles and piercing black eyes, a glint of madness flashing inside them. The man had his arms crossed as he looked up at a crystalized element being held in a machine above him, looking sinister in his charcoal suit with a shiny black plating of armor as he stood in front of a grey panel.

The taller male with short white hair put a hand on his eyes, covering the insane glint. "Why do you continuously try to stop me?!"

The indigo hero looked at the machine before staring back at his nemesis. "Because you're hurting people. You mustn't mess with things we do not yet comprehend. You've killed billions trying to-!"

"Shut up! You don't understand anything!" Seishin took out twin plasma guns and started shooting at the boy in indigo, but he couldn't hit him, the hero was too fast. Activating the security on the panel, the villain made whips of plasma try to grab the indigo hero. Dodging with twisting flexibility, the hero continued to evade the attacks from the system and the shots from Seishin.

"I understand your motivation, but it doesn't justify killing billions of people to get what you want! No reasoning can defend killing the lives of countless families!" the teen yelled at the top of his lungs, activating a plasma sword and pressing a few buttons to get a few orbs. He began to move faster, gliding along the walls as he froze the security system with the orbs. When the system was taken care of, he jumped off the walls, aiming to tackle Seishin. His opponent flinched at his action and stepped back instinctively. He tried to shoot the young hero, but he was tackled before he could pull the trigger. He growled as he realized there was a plasma sword in both his guns.

Both of them were panting, the teen's breathes were more deep though. "I…Everyone understands, but we know when things are being taken too far…"

Seishin glared with a snarl. "There's no such thing as taking it too far!"

The man kicked the indigo teen off of him and flipped. The hero stumbled a little, trying to regain his footing and posture. His plasma swords blazed while the disks hummed in anticipation, ready to attack if Seishin did anything funny. The teen sighed. "Stop this. You can't beat me without your army."

Seishin looked at the indigo boy with fires of hatred swirling in his insane black eyes. He loathed this boy and he wasn't going to let him get what he wanted. After all, the hero was preventing him from getting what he wanted. He sneered and pulled out another gun, though it was smaller than the others, and pointed it at the teen. The smaller boy raised his guard and readied himself. Seishin's eyes narrowed.

Suddenly, the villain did something the hero didn't expect. He pointed the gun at the shining crystal in the machine and fired. As the boy moved to stop him, crying out, a light enveloped them and darkness took over them.

When the indigo hero woke up, he groaned, feeling the soft-ish plastic beneath him. He opened his eyes and looked around. Immediately, his eyes widened with horror. Confusion enveloped his mind like he was stuck in a world with no up or down. All around him were lights brightening up the night sky and buildings, but not just any buildings. They were buildings from the old San Fransokyo, looking just the way he remembered it with its familiar structures and balloons, one of which he had been sleeping on.

Too shocked to move and too confused to think right, the young man said the only thing that he could.

"…U-Unbelievable."

Apologies for any bad grammar. I'm not every good at catching my own mistakes.

"U-Um, Miss Pure..."

"Hm? What is it?"

"...How do I get down?"

"..."