In the year 1989, a simple window cleaner is working outside of a skyscraper. Intending to play a prank on his angry boss, the unlikely hero discovers a secret passage leading to a time machine along with mysterious alien documents. Operating the device transports the protagonist to the year 1304, where he is given a seemingly ordinary task of rescuing a lady in danger. However, he soon finds out about a much more serious threat of a global alien invasion. The hero has to travel to the remote future of the 44th century and eventually to the even more remote past of the Cretaceous period to foil their plans.