Although the Project Quantum Leap isn't ready yet, Sam Beckett doesn't listen to supercomputer Ziggy, hops into the Accelerator and leaps. As Tom Stratton, an Air Force test pilot about to attempt a dangerous flight. Sam finds his memory Swiss cheesed, with only enough left to know that he is not where or when he belongs. According to Sam's friend and partner Al, who appears to him as a hologram nobody else can see, Al explains that the Project has gone awry and in order to leap out of the pilot's body, Sam must successfully fly the X-2 to Mach 3, which according to historical records, ended in a fatal crash.

Sam and Al have switched places. Now Sam is the hologram, and Al is the leaper. Al must reunite a returning WWII veteran with the woman he left due to the war. Sam and Al must figure a way to communicate with the future, because Al has the comm device, and Sam has no way to contact Ziggy.

Sam's leap takes a dramatic turn when he begins leaping randomly throughout the life of Lee Harvey Oswald, accused assassin of President John F. Kennedy. Matters are complicated further when Sam's mind becomes tangled with Oswald's.

As the date for Dallas draws nearer, Oswald's personality is getting harder to control. Al is finding it harder to connect with Sam. Is Sam supposed to save the President, or unearth the conspiracy?

Sam leaps into a hostage situation as a fugitive killer. The real killer breaks out of the Project facility and is on the run in 1999.

Sam leaps into a bar with a bartender that's more than he appears. When Sam looks into a mirror, he sees his own reflection. In the future, they realize that Sam has leaped into himself, they search history for Sam. Sam learns more about Quantum Leap, and who's responsible for his leaps. Before he takes his next leap, he realizes he must correct something that could affect his personal history.

Sam leaps into a hostage situation as a fugitive killer. The real killer breaks out of the Project facility and is on the run in 1999.

Sam and Al have switched places. Now Sam is the hologram, and Al is the leaper. Al must reunite a returning WWII veteran with the woman he left due to the war. Sam and Al must figure a way to communicate with the future, because Al has the comm device, and Sam has no way to contact Ziggy.

Although the Project Quantum Leap isn't ready yet, Sam Beckett doesn't listen to supercomputer Ziggy, hops into the Accelerator and leaps. As Tom Stratton, an Air Force test pilot about to attempt a dangerous flight. Sam finds his memory Swiss cheesed, with only enough left to know that he is not where or when he belongs. According to Sam's friend and partner Al, who appears to him as a hologram nobody else can see, Al explains that the Project has gone awry and in order to leap out of the pilot's body, Sam must successfully fly the X-2 to Mach 3, which according to historical records, ended in a fatal crash.

Sam leaps into a bar with a bartender that's more than he appears. When Sam looks into a mirror, he sees his own reflection. In the future, they realize that Sam has leaped into himself, they search history for Sam. Sam learns more about Quantum Leap, and who's responsible for his leaps. Before he takes his next leap, he realizes he must correct something that could affect his personal history.