After a mysterious criminal steals a secret time machine with the intent of changing the past to destroy America, the future of humanity lies in the balance. To deal with the threat, a handpicked team is formed consisting of a scientist, a soldier, and a history professor, who use a prototype of the machine to travel back to critical points in time.

The mission won't be easy, as the team must must be careful not to let their actions adversely affect the past, while also staying one step ahead of the dangerous fugitive in order to put a stop to his path of destruction before time runs out.