The U.S. government adapts technology from an alien spacecraft at Roswell and create a device that can travel back in time seven days. When Washington is devastated by a terrorist attack, the need to find a capable pilot becomes essential and with time running out, only mental patient and ex-military man Frank Parker proves suitable.
A doctor in California destroys the entire state by experimenting with explosive fault line devices, and Parker must prevent a tidal wave from killing over ten million people. Complications arise when he Backsteps and ends up with a strange creature capable of generating temporal disruptions that is intent on destroying Backstep.
When the Pope is assassinated, a mixed-up Backstep occurs and Parker finds himself occupying the body of the Holy Pontiff.
When a reverend fighting against drug deals in Donovan's old neighborhood gets killed, Donovan's sister is killed as well. Donovan investigates and is arrested for killing one of the men responsible, and Frank engineers a Backstep to go back and save his friend.
Parker is ordered to Backstep in order to prevent a Presidential candidate from being assassinated. His mission is a success and the Governor asks him to join his campaign team, but Frank soon discovers the Governor has psychological issues and his daughter is trying to get the evidence to the public.
A militia leader detonates a nuclear bomb in Washington, but the Backstep goes awry when the Sphere goes back without Parker - the team has 7 days to figure out what disaster is coming and resolve it before it's too late, and all they have to help them is a reluctant psychic who was part of one of Mentnor's past experiments.