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 has his hands full when he has to Backstep to prevent the death of the U.S. President's rebellious daughter at the hands of a vicious killer.

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.

When Talmadge becomes incapacitated because of an apparent brain aneurysm, Nathan Ramsey is appointed as his successor, and Ramsey immediately begins to implement Parker's removal.

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

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 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.

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 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.

A missile test disaster sends Parker back in time to find a beautiful revenge-minded thief who has stolen the device that will cause the disaster.

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.

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.

Parker causes the delay of an important Backstep mission to go to New Orleans to prove the innocence of an old friend scheduled for execution for a murder he didn't commit.

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

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

Mentnor's post-World War II experiments return to haunt him, as a virus that causes homicidal madness gets loose in an isolated New England village.

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.

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

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

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

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 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.

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

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

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...

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 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.

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

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

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 must decide whether or not to heed the words of a man who claims to have Backstepped from the far future, and warns that Earth's safety depends on the death of a revered holy man.

A power surge sends Parker into a mirror universe where his colleagues now play threatening roles.

Parker must go back to his old mental hospital to work undercover to find a killer who influences others to kill and maim based on astrological patterns.