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 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.

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

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...

A tanker truck filled with a deadly acid explodes killing 86 people and devastating the North Korean embassy and threatening to trigger a war.

When the team at Never Never Land compound hears news that the United States is in danger of being taken over by terrorists, Operation Back Step is put into effect. However, after Dr. Ballard modifies the sphere, a glitch causes Frank Parker to separate into two people.

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.

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.

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

Parker must prevent a terrorist plot to have American planes bomb a U.S. command center in Saudi Arabia, but an accident during the Backstep makes things go a little crazy.

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

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.

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

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.

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

A former Backstep pilot, thought to be dead, seeks revenge by trying to sabotage the Sphere.

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.

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.

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.

The President's briefcase containing the missile controls is lost on the streets of Washington D.C.

Teens playing video games are actually being used to pilot missiles.

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.