Bruce Banner invented time travel at age thirteen. Nothing was impossible anymore; he would become the world's most famous scientist.

Then things went awry — he was so confident that he tested it on himself. He never found out what exactly went wrong, but he sent himself slightly over a decade into the future. By that time his real parents had deceased, so he found himself a scientist that was willing to be his 'foster dad' until he fixed the time machine.

But then one day he accidentally established contact with a mysterious 'Mr Green'. Mr Green seemed to be suffering from Gamma poisoning, and seeing as how Gamma radiation was one of Bruce's areas of expertise, he agreed to help, corresponding under the name Mr Blue.

As time passes, between working on his time machine and communicating with Mr Green, Bruce got more and more caught up into the mystery. He'd come up with at least twenty cures, none of which had worked long-term. Eventually he decided that it was time for him to meet this Mr Green, and ensure that this wasn't some futuristic fantasy.

But then his foster dad, Samuel Sterns, found out about this 'Mr Green', confiscated Bruce's laptop and all his research, and inspecting and diluting blood samples to study the mystery himself. One day he announces that he'd even met Mr Green, which of course piqued Bruce's curiosity even more. Who was this mystery man?

When a disaster renders Samuel unable to further take care of him, Bruce decides to go after the mystery himself.

What will happen when he comes face to face with... himself?