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 of a heart attack, and his brother (David Newsom) from getting killed in Vietnam.

Note: Scott Bakula plays a dual role in this episode, also appearing as Sam's father, John Beckett.

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.

Notes: 1) This is Sam's first leap out of the United States. 2) Tia Carrere and Patrick Warburton also guest star. 3) The character Herbert "Magic" Williams would later appear in a main role in the 2022 revival series, with Ernie Hudson replacing Christopher Kirby.

Sam leaps into Father Francis "Frank" Pistano (Bud Sabatino), a priest who must help prevent a fellow man of the cloth (Sandy McPeak) from losing his faith and self-control.

As Karl Granson (Danny McCoy Jr.), a well-known fashion photographer, Sam must protect a female fashion model (Marjorie Monaghan) from overdosing on amphetamines imposed on her by her manager (Susan Anton).

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 clues are messages detailing the deaths on a typewriter.

Notes: 1) Set in Maine, Sam inadvertently gives Joshua Rey's young budding author friend, Stevie (a.k.a. Stephen King), plot ideas for a number of King's future best sellers. 2) The theme of an evil entity being upset that Sam is undoing its evil deeds is revisited in the season 5 story arc of the Evil Leaper, starting with "Deliver Us From Evil". 3) The 2nd Handlink makes its first aired appearance on the show. (A strange occurrence if Sam only dreamed about it)

Sam leaps into Darlene Monty (Theresa Ring), a beauty pageant contestant who must protect a naive fellow contestant, Connie (Heather McAdam), from ruining her life by posing for nude photographs, and in the process must ensure that his host places at least third in the pageant so that she can win a scholarship and become a doctor.

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

Notes: Marc Alaimo and C.C.H. Pounder also guest star. Pounder later became Bakula's co-star on NCIS: New Orleans.

Sam leaps into a traveling amateur magician named Harry Spontini (Dan Birch), he must perform some real magic to prevent losing custody of his young daughter (Lauren Woodland) to his ex-wife (Amy Steel), as well as save the girl from performing a dangerous trick that will go wrong. Notes: Al Breaks the 1st Handlink in this episode and it's never seen again

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.

Note: Diedrich Bader and Mark Boone Junior also guest star.

Sam leaps into Reginald Pearson (Milan Nicksic) on Christmas Eve, a personal valet to Scrooge-like industrialist Michael Blake (Charles Rocket). Blake is bent on demolishing a Lower Manhattan mission, despite the pleas of Salvation Army Captain Laura Downey (Melinda McGraw), forcing Sam and Al to show him his fate in an attempt to change his mind. Blake, because his "neurons and mesons are on a frequency close to" Sam's, can clearly see and hear Al.

Sam leaps into Butchie Rickett (Buff Borin), a 13-year-old boy who is on cross-country family summer roadtrip, from which Butchie's mother (Sandy Faison) will soon disappear, while also dealing with the assertiveness of the father (Sherman Howard) and the bullying of the older sister (Ami Foster).

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.

Note: Parley Baer also guest stars, as the local doctor. Anne Haney guest stars as Cassy Thailer, the adoption counselor.

Sam leaps into Kenny "Future Boy" Sharp (Matt Marfoglia), an actor on a children's sci-fi show, and must work quickly to keep his eccentric co-star, Moe Stein (Richard Herd), from being killed. Stein had died when his grown daughter (Debra Stricklin) committed him to a mental institution because of his "wild" theories about traveling in time. In the process, Sam learns, much to his surprise, that Stein has independently come up with Sam's own 'string theory' of quantum leaping-due to Sam having written a 1957 letter to Stein asking about the string theory' of quantum leaping

Sam is Rod "Rod the Bod" McCarty (Chris Solari), a Chippendales dancer who must help a deaf woman (Rhondee Beriault) find success as a professional dancer, before she goes down a road of prostitution and dies of AIDS.

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.

Note: at 64 months, this episode had the narrowest margin between the date the episode aired and the historical date that Sam leapt into.

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).

Note: Diane Delano also guest stars. Lauren Tom guest stars as Sophie. David Graf guest stars as Sheriff Nolan.

Sam is Geoffrey "Tonic" Mole (Bruce Michael Paine), the lead singer of a KISS-inspired rock band who in the original history was murdered by an unknown assailant in a crowd. Sam must find out whether it was the manager (Peter Noone), fellow band member Flash (Jonathan Gries), a random fan, or his host's estranged son (Christian Hoff) who did it, and stop them before the deed can take place.

Sam leaps into Gordon O'Reilly (Ken Kells), a bounty hunter handcuffed to a compulsively lying woman (Jane Sibbett) who is suspected of embezzling a large sum of money, and must decide whether his mission is to help the woman escape or bring her to justice.

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. He is clandestinely helped by lawyer Lorrea Tearsa (Jenny Gago), from the office of the crooked DA (James Sloyan), who is intent on sentencing as many people as possible to death by withholding evidence.

Note: strapped into the electric chair, with the switch about to be thrown, Sam says "Oh, God!", rather than his usual arrival exclamation of "Oh, boy!".

Sam leaps into Terry Sammis (Jeff Hochendoner), a.k.a. "Nikolai Russkie", a professional wrestler of Lithuanian origins who must prevent his brother, Ronnie (Jerry Bossard), from dying of a heart attack during their championship tag team match.

Note: Terry Funk also guest stars, as one of the championship tag team opponents.

Sam leaps into Eddie Elroy (Patrick M. Bruneau), a college student helping his brother Mac (Timothy Carhart) sell nuclear bomb shelters during the Cuban Missile Crisis, and must prevent their neighbor (Kurt Fuller) 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 Tibby (Scott Lawrence), a mentally challenged young man, learn how to read. Al is able to do so 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.

Note: 1) This is the only episode where it is Al, not Sam, who does a musical number. 2) Brief cameo appearances are provided by the same actors who represented people Sam leapt into in previous episodes. 3) While not a full clip show, brief clips of past episodes are interspersed.