September 13, 1956: Sam Beckett wakes up in 1956, disoriented, suffering from amnesia, but he has the awful realization that he does not belong there...

November 8, 1965: Sam becomes a hit man in 1965 whose romance with the godfather's girlfriend places him in danger.

April 27, 1960: As Tom McBride, a New York City cop on his honeymoon, Sam must save himself from a jealous, and sociopath, ex-husband. To make matters worse, the Project's funding will be cut off, stranding Sam alone in the past, unless he can prevent the U2 flight from being shot down over Russia.

August 4, 1953: As a sailor returning from Japan, Sam brings a foreign wife to a small town. He then has to fight against the prejudice of both a scheming ex-girlfriend, as well as his mother, in order to gain acceptance of his new bride.

November 6, 1962: Keeping his best friend from throwing the high school championship football game, costing both of them their scholarship offers, Sam must also get their families to consolidate.

September 26, 1973: Protecting a female member of the witness protection program from a mafia hitman proves difficult for Sam, since the FBI appears to have an informant confounding his attempts to hide her.

September 4, 1954: In order to help his granddaughter save a small bar from the slimy loan shark holding a note on the place, Sam has to play pool like a pro...with a little help from Al and Ziggy.

April 1, 1969: When Sam leaps into the life of an undercover cop, Al explains that his mission is to convince a navy nurse that her MIA husband is still alive, and to prevent her from marrying a lawyer she meets on the day Sam leaps in. But a series of coincidences causes Sam to wonder about the true nature of his mission.

November 25, 1969: As himself at the age of 16, Sam has the opportunity to both win the high school basketball championship and save his family from their sad fates.

April 7, 1970: As a Navy SEAL in his own brother's squad, Sam must determine whether he is there to save Tom's life or ensure the success of the mission on which his brother was killed. Also Al from 1970 was a P.O.W.

June 15, 1945: Struck by lightning, Sam and Al find their roles reversed, as Sam returns to the future, and to a long-lost love, while Al leaps back to 1945 to prevent the death of a returning World War II hero and his former girl friend.

August 13, 1956: Flying over the Bermuda Triangle, Sam, as the co-pilot, must prevent the flight from returning to Virginia, to get a seriously ill passenger to a doctor before she dies. Flying through the triangle is riskier than it seems, and Sam, deprived of Al's help when the hologram fades out, must get them through alive.

June 25, 1957: Sam leaps into Al Calavicci to prevent the death of his married lover. But when Sam accidentally alters history, and finds out too late about her untimely demise, it could mean the gas chamber for Al and disturbingly a whole new situation at Project Quantum Leap.

October 5, 1957 - November 22, 1963: As a result of leaping again before he had a chance to complete his original mission, Sam finds himself leaping back and forth through the life of Lee Harvey Oswald. Following the sole assassin theory, Sam and Al attempt to prevent Oswald's attack on John F. Kennedy. But, with each leap giving Oswald more control over Sam's body, history seems doomed to repeat itself.

October 5, 1957 - November 22, 1963: As a result of leaping again before he had a chance to complete his original mission, Sam finds himself leaping back and forth through the life of Lee Harvey Oswald. Following the sole assassin theory, Sam and Al attempt to prevent Oswald's attack on John F. Kennedy. But, with each leap giving Oswald more control over Sam's body, history seems doomed to repeat itself.

August 8, 1953: Sam lands in a not-so-ordinary bar in a coal-mining town, where strange things are happening and familiar people don't know him. With the help of another Al, he still has something to set right ... or is there more than one thing he needs to change?