Janitor Josh Futturman leads a pretty boring life, spending much of his time playing video games when he's not working. Things change, though, when he beats a video game that the rest of the world has given up on, thinking it was unbeatable. After he defeats the game, mysterious visitors from the future appear. They put the world in danger, and Josh is the only person who can save it. He assembles a team to assist him as he travels through time, completing various missions as he does whatever he can to try to save Earth from the extraterrestrial visitors.