After a disastrous confrontation between a religious cult and the U.S. government, Parker is sent back in time to undo the event.

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.

Good-Frank tries to make his way to Backstep to stop Starker from initiating his military coup and taking over the U.S. government (with the aid of Parker's evil duplicate) while the U.S. and China are on the brink of nuclear war.

Parker is assigned as the "chrononaut" for Backstep. While memorizing all the mission details, Parker discovers via TV that his son has been killed by poison gas during the attack on DC. Finally, the backstep is authorized.

After a sabotaged Backstep, Parker seems to be killed. Now a disembodied Parker must somehow convince Olga he's not dead.

Olga is kidnapped and replace by a look-alike, with the intention of stealing Operation Backstep's secrets.

Talmadge decides to authorize the use of Backstep in order to save Dr. Jonathan Axelrad, a man with the secret to cold fusion. But everything is not what it seems...

As the team vacations in Las Vegas, a group tries to rob a casino to save their African village.

When a Back-Step is made to prevent a toxic spill, Parker discovers an alien cover-up.

When Parker and Donovan are to be honored at the White House, they are caught up in an intricate assassination scheme.

Parker discovers a secret lab at Never Never Land with an alien alive from the Roswell UFO crash - the alien escapes and sets off a nuclear disaster.

A top secret weapon project test gone awry seemingly kills all life on Earth except Parker, Olga, and Owsley who are deep underground in a secret government facility. Now they must make it back in time to Backstep.

The President and Vice President were killed in a terrorist attack. Now it seems that a secret branch of the government has in their possession technology from the alien landing at Roswell, and they were able to use it to create a time machine that can send someone back in time seven days. And they would like to send someone back before this happened and tell what's going to happen before it does so they can prevent it. Now all they need is someone to send back, as the trip is excruciating. Frank Parker is an ex-Navy SEAL and CIA operative who has been confined to a mental hospital. He has been chosen as their "chrononaut" (or time traveler), as he has a high tolerance for pain, but at the same time he's a bit of a wildcard, as he doesn't like to be told what to do, or follow rules.

Parker is sent back in time by a dying Olga to stop the spread of a deadly mutated Ebola virus.

A young secretary, Rebecca, goes underground after the NAS office she works for is destroyed in an explosion and it is believed that she is the one responsible.

Just as Parker and Olga start to become romantically involved, Olga's husband Josef returns from the future to claim his wife and join the team.

The Vice-President's illegitimate daughter, an Air Force flyer, is shot down in Bosnia. After she's killed along with her Ranger rescue team, and her father kills himself out of grief, Parker must jump back in time to save the mission.

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.

When a Russian spy submarine gets trapped on an ice shelf off the coast of Alaska, its nuclear fuel is released into the atmosphere, causing widespread devastation. Parker must link up underwater with the submarine before it happens again.

Parker balks when ordered to kill an autistic savant, Walter, whose code-breaking skills are put to use by enemy spies to kill 20 CIA agents.

Atmospheric interference causes Parker to return from a back-step with a woman who died fifteen years ago, and whose presence threatens to unravel the fabric of the universe.

An astronaut returns with an alien virus that makes him irresistible to women, and Olga soon finds herself pregnant with a clutch of alien babies.