When a supercomputer with artificial intelligence deactivates the U.S. nuclear weapons systems, Parker must take advantage of its infatuation with him.

Parker quits when a Backstep is cancelled that would have saved children on a subway train from being killed, and the team must question whether they obey NSA orders or act on their consciences.

A falling scaffolding hurts Parker, and as Olga keeps vigil over him in his coma, she professes her love for him just as he wakes up to hear her. Through an increasing series of dares they end up getting married . . . but all is not what it seems.

An alien implant cures Dr. Ballard's paralysis, but results in his mind being taken over by Adam, the Roswell alien (from ""Lifeboat"").

Parker backsteps to save Olga's sister, Svetlana, from the Russian mafia.

Parker Backsteps to prevent a collapsed dam from killing people, but when under the influence of alcohol lands in the middle of an execution, letting a serial killer escape. Frank insists on taking on the investigation to make up for his screw-up.

A wiring problem causes an explosion at the wedding of Princess Lisette, and Parker must Backstep to protect the Princess and Olga, after discovering terrorists were responsible.

Parker must Backstep to prevent a submarine from blowing up, and a U.S. cruiser in the area from triggering a nuclear war between China and the U.S.

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.

Parker Backsteps to prevent a mine shaft from exploding and killing thousands of people, including a nearby military base. However, things go awry when the Sphere materializes deep within the Earth and the Backstep team have no idea where Frank is or what he was sent back to avert.

Parker Backsteps to save a Nobel Peace Prize recipient, but passes through the side of an airline flight, causing it to crash. A boy on board the plane is taken along with Frank into the past, and he must save the Peace Prize winner, stop the crash, and help the boy save his grandfather.

Parker must save Talmadge, who is captured by commandos who intend to torture and kill him for information on Operation Backstep. But when he fails, only his newfound ability to loop time lets him complete the mission.

Parker must prevent the Global Space Station from exploding in space and releasing large amount of plutonium into Earth's atmosphere...but due to the narrow threshold he must dock with it in space.

Parker Backsteps to stop Fidel Castro's son Teo, a boxer, from being murdered in his comeback fight - an incident that leads to Castro launching a nuclear missile strike on Miami.

Parker and Olga must recover a kidnapped baby created in a lab as part of a genetic experiment to breed super-geniuses.

Parker must Backstep to prevent Ramsey's younger brother, mentally ill and off his medication, from killing a Senator.

When the Pope is assassinated, a mixed-up Backstep occurs and Parker finds himself occupying the body of the Holy Pontiff.

Parker Backsteps to prevent three high school girls from accidentally blowing up a hotel, but it turns out to be a bit more involved then that.

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.

A scientist comes up with a cure for cancer, unaware it will unleash a deadly plague. The NSA of 168 years in the future send back an assassin to kill her before her "cure" wipes out the world.