Prologue: Something about time

Raiden Hamada had seen it all. He had been there when his older brother died, and when his younger brother fell into depression. He was there when Hiro discovered Baymax, and when Hiro founded Big hero six in 'secret'. He had been there when KreiTech was destroyed and when Baymax was left behind. He saw his brother create friends he never had and his Aunt had a bond stronger than ever before with her youngest nephew. Still, he was not happy. You see, Hiro had not included him in Big hero six. In fact, Hiro had not spoken to him since before Tadashi passed away. Hiro was happy, and so was everyone else. Raiden though, had a way off making them even more happy. He would safe Tadashi. Of course you wonder how he would do such a thing. You can't raise people from the dead. It's a good thing Raiden didn't need to.

Raiden had worked day and night on a project he knew would save his brother and restore order. He spend countless hours in his SFIT lab calculating and building and programming. He had done it though. He had built himself a time machine. Of course there were some drawbacks. For starters, he could only send himself back for five minutes, which wasn't long at all. He also needed a lot of power to get the machine going, so he could only use it once, maybe twice. He could not go back and change an event once it was changed.

Also, he would probably pass out and wake up in the new time loop, without any memories off what happened after the event he changed. Only those memories off his own time loop would remain. If he made one small mistake in the calculations he could be lost in time for ever. He had to be careful.

Tonight was the night. He would travel back in time. He calibrated his machine and packed a bag full off all his notes on time travel, as well as all his tools and other notes on robotics. He could never be to sure off where he would end up after his travel.

Raiden also grabbed some clothes and covered his white hair with a black beanie. He looked a lot like an older version of Hiro if you took the white hair away. He was hoping that by covering it up people in the past wouldn't recognize him. He set the date and time for the explosion, and the location in front of the SFIT building. He was ready. He took one last look at his lab and hoped everything would be better when he returned.

At first his vision was blurry. He could make out figures walking around, and heard his aunt talk about diner. He was in the right place at the right time. He snuck up to the front off the building and waited for the fire. When it started, all he had to do was wait for Tadashi to shop up. Tadashi tried ot play hero like he did before, but this time Raiden tacked him to the floor and pinned him. Right after that the explosion shook the building. Raiden got up and ran off, hoping Tadashi didn't get a good look at him. He found a dark street and waited. Thirty seconds later the world went black before his eyes, and he knew he had made a mistake in calibrating his machine. He just hoped that when he awoke, he would not be in a time to far from his own.

[A/N: Hello people and welcome to my story. This is a fiction that has been haunting me for a while and I finally started to write it. It is not finished but I hope to update regularly . Please enjoy and leave any comments you have behind. The next chapter will be longer and have more explanation on what is going on. Also I decided to leave the cannon for what it is since you all know the story and I didn't feel like repeating it. Hope to see you at the next chapter.]