When Bradley appears to be having a breakdown because he is talking about Backstep among other things, he is relieved of duty and Ramsey replaces him. Later they learn that his breakdown was caused by something that could be treated. So they ask to Backstep so they can help him but their superiors refuse to grant it.
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 is at odds over how to deal with a Latin American dictator. He's been having strange dreams that he tells to his therapist who records them. One day someone grabs the therapist and takes the tapes of the President's sessions. Later the dictator calls the President and says he has his tapes and will release them unless he gives him his support. When Backstep learns of this, they learn about the therapist's disappearance and send Frank to find out if the two events are related. When he arrives, he goes to the therapist's office just as her abductors arrive...
When the President's daughter who's a wild child is killed, and the President is depressed, Frank is sent back to save her. Frank saves her but she's still wild which exasperates the Secret Service Agent assigned to her.
When someone sets a nuke off, Frank is sent back to avert it. They give him what info they could get on who may have done it. However because of a mistake on Frank's part, the sphere gets sent back without Frank. So they inspect the sphere and find Frank's bag and inspect it and the only item that doesn't appear to be among the things he usually brings with him is a key. That's when Isaac decides to bring in a girl who is a psychic, whom he worked with years ago when she was around nine and who decided to stop working with him because she couldn't fully comprehend her...
As tensions with North Korea increase, the by-the-book commander of an American nuclear silo fires a missile despite incomplete information, causing a war. Parker must travel back to try and convince the man what is the right action to be taken.
Several people including the Canadian Trade Minister are killed in a mysterious fire. Bradley learns from the CIA that the fire was caused by a secret weapon which has fallen into the wrong hands. So Frank is sent back to get it back. He runs into the man who supposedly has it but all he has with him is a boy. Frank escapes with the boy and learns who the weapon is.
A deadly gas leak kills thousands of Russians and leads to a coup and power vacuum. When Olga is paid a visit by a former lover seeking her help with the Russian time travel program, she puts the world in peril.