Quantum Leap (season 3)

Sam leaps into himself as a 16-year-old boy (Adam Logan) on Thanksgiving and Al tells him he is there to win a basketball game that was a turning point in many people's lives, but Sam wants to take the opportunity to prevent his sister (Olivia Burnette) from marrying an abusive alcoholic, his father from dying from a heart attack, and his brother (David Newsom) from getting killed in Vietnam.

Sam leaps into Herbert "Magic" Williams (Christopher Kirby), a U.S Combat Swimmer in his brother's UDT/SEAL platoon in the Vietnam War, where he is given another chance to keep his brother (David Newsom) from dying, but runs into complications from news photographer Maggie (Andrea Thompson) and serious consequences for a close friend.

Sam leaps into horror novelist Joshua Rey (Chris Ruppenthal) on Halloween and finds himself surrounded by mysterious deaths. Al and Ziggy are not predicting the deaths, and Sam needs to prevent the strangulation of Joshua's fiance Mary (Valerie Mahaffey), but Sam is running out of time and suspects, while the only clue is messages detailing the deaths on a typewriter.

Sam leaps into an African-American named Ray Harper (Garon Grigsby), a medical student engaged to Becky (Corie Henninger), who is white, on the day of the Watts riots. He must prevent Becky from being killed, while persuading her that they need to stay in Watts.

Sam leaps into Shane "Funny Bone" Thomas (Kristopher Logan), a member of a biker gang where he meets a truck stop restaurant owner (Theodore Wilson) who lost his son to the Korean War and an idealistic young woman (Josie Bissett) who is going to die unless she gives up her reckless dream of living the hard life of Jack Kerouac.

Sam leaps into Billie Jean Crockett (Priscilla Weems), a pregnant teenager being cared for by local woman Dottie (Lana Schwab), who needs to keep her baby and obtain the support of her own father (the episode's director, James Whitmore Jr.), a fact made all the more confusing by the fact that Sam seems to be pregnant even though he lacks the 'equipment' to carry a child.

Sam leaps into Joey DeNardo (Sam Clay), a lounge singer in the witness protection program (hiding under the name Chuck Danner), who must keep himself and his accident-prone girlfriend, Lorraine (Marietta DePrima), from being killed for a murder he witnessed three years prior.

Sam leaps into Gilbert LaBonte (played by Richard White), the owner of a New Orleans brothel to prevent one of his girls, Gina (Georgia Emelin), from disappearing after a confrontation with her abusive husband, while also avoiding marriage to another of his girls, Gina's Aunt Marsha (Rita Taggart).

Sam leaps into Jesuś Ortega (Stephen Domingas), a man about to be executed by the electric chair, until he is suddenly given a temporary 48-hour reprieve to (apparently) try to prove his innocence.

Sam leaps into Terry Sammis (Jeff Hochendoner),a.k.a. "Nikolai Russkie", a professional wrestler who must prevent his brother from dying of a heart attack in the championship match.

Sam leaps into Eddie Elroy (Patrick M. Bruneau), a college student helping his brother sell nuclear bomb shelters during the Cuban Missile Crisis, and must prevent their neighbor from being shot during a false air raid.

Sam leaps into Sam Beiderman, a depressed mental patient who receives shock therapy as soon as Sam leaps in. This causes Sam's personality to become displaced, resulting in his assuming the identities of people he has leaped into before. It's up to Al to complete Sam's mission by helping a mentally challenged young man learn how to read, which he is able to do when he discovers that he and Sam can be seen by mentally ill people. He must also find a way to restore Sam's personality so he can leap, or else risk losing contact with him forever.