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Dr. Samuel Beckett (Scott Bakula) - The mastermind behind Project Quantum Leap who leaps back and forth within his own lifetime, putting things right that once went wrong. See main article for more.
(Dr. Samuel Beckett) (Main characters) -
Rear Admiral Albert Calavicci (Dean Stockwell) - Sam's right-hand man who appears in the form of a hologram that only Sam can see and hear. See main article for more.
(Admiral Albert Calavicci) (Main characters) -
Ziggy (voiced by Deborah Pratt) - The supercomputer Sam designed to run Project Quantum Leap. The computer has a feminine personality and a massive ego; the latter feature is an accomplishment Sam is particularly proud of, as it makes Ziggy much more than a simple number-crunching machine. In early episodes, it is suggested that Ziggy is the computer's operator. But when Sam speaks to Ziggy directly, it shows that Ziggy is a self-operating computer who is capable of recognizing and expressing human emotions. Ziggy is programmed with historical information through Sam's life and has access to outside databases, and is able to project the likely effect of Sam's actions on history. While Al is with Sam, he gets information from Ziggy through a faulty handheld device. Al can get information from Ziggy through this device, or by simply asking out loud (Al sees whatever location Sam is in as a holographic projection and is always physically in close proximity to Ziggy).
(Ziggy) (Main characters) -
Dr. Donna Alizzi (Teri Hatcher, age 19 / Mimi Kuzyk, age 45) - Born Donna Wojohowitz, she is Sam's wife and director of Project Quantum Leap in her husband's absence. Originally, Donna was not involved with the project, until Sam altered history, thus ensuring her involvement and getting rid of the Committee (see below).
(Project Quantum Leap) (Recurring characters) -
Dr. Irving "Gooshie" Gushman (Dennis Wolfberg) - Project Quantum Leap's head computer programmer and senior operations coordinator. A quirky man, Gooshie is often described as "a little guy with bad breath". He is the butt of jokes between Sam and (especially) Al. When he is seen, he tends to be in a state of worry due to Sam's present situation. Gooshie once filled in for Al as Sam's holographic contact when Al was busy attempting to track down a murderer who escaped the waiting room.
(Project Quantum Leap) (Recurring characters) -
Dr. Verbena Beeks (Candy Ann Brown) - The project's head psychiatrist. It is her job to work directly with the person Sam displaces when he leaps as they are often in a state of shock and panic when they arrive.
(Project Quantum Leap) (Recurring characters) -
Tina Martinez (Gigi Rice) - Tina is a medical technician that works on the Project. No one can enter the Imaging Chamber or the Accelerator Chamber without first being inspected by her. She is Al's girlfriend and is also having a secret affair with Gooshie. In the episode where Sam accidentally erased Al from existence, she was married to Gooshie.
(Project Quantum Leap) (Recurring characters) -
Edward St. John V (Roddy McDowall) - When Sam changed history and accidentally erased Al from existence, Edward St. John V appeared as his holographic contact. After correcting the error, Al reappeared. Whether or not St. John works on the Project outside of that alternate timeline is unknown.
(Project Quantum Leap) (Recurring characters) -
Samantha Josephine "Sammy Jo" Fuller (Kimberly Cullum, age 11) - Project technician who works on the project. She is the biological daughter of Sam and Abigail Fuller, conceived during a leap into Abigail's fiancé in 1966. Only the child-version of Sammy Jo is ever seen. Sammy Jo spends her life believing that Abigail's former fiancée is her biological father, and she is never told anything different. Sam figures out that Sammy Jo is his daughter, and Al confirms this through Ziggy. Child Sammy Jo resembles Abigail at the same age, but with Sam's hair colour. She has a fascination with time travel and has a photographic memory, and bonds easily with Sam. Sam has no memory of meeting adult Sammy Jo, even though she works on the project with him. Ziggy's prediction that Sam will forget this secret when he has his next leap comes true. This means that only Al knows the truth about Sammy Jo's parentage.
(Project Quantum Leap) (Recurring characters) -
Senator (Warren Frost) - The head of a government oversight committee that tried to shut down Project Quantum Leap when Sam failed to stop the downing of a U-2 spy plane.
(Project Quantum Leap) (Recurring characters) -
Senator Diane McBride (Alice Adair) - Although he failed to stop the U-2, Sam did change history and Senator Diane McBride became the head of the oversight committee and ruled to continue the Project's funding. Al witnesses the former Senator morph into Diane. He immediately realizes that his was the result of Sam changing the timeline, but is the only person who is aware of it. He never mentions what he witnessed to anyone.
(Project Quantum Leap) (Recurring characters) -
The Committee - Led by men named Weitzman and Bartlett, the committee oversaw Project Quantum Leap until Sam altered history, bringing Donna onto the Project, assuring government funding and eliminating the need for the Committee.
(Project Quantum Leap) (Recurring characters) -
John Samuel Beckett (Scott Bakula) - Sam's father, a gruff but kind dairy farmer in Elk Ridge, Indiana. He was named after his grandfather, a Civil War officer. When Sam leaps into his teenage self, he recalls that his father had died a few years later due to poor health. Sam fails in getting him to quit smoking. However, Sam would encounter his much slimmer father in another leap many years after his father's death. This confirms that Sam managed to convince his father to make better dietary choices, thus improving his health and greatly extending his life.
(Friends and Family) (Recurring characters) -
Thelma Louise Beckett (Caroline Kava) - Sam's mother. After her husband's death, she moved to Hawaii to live with her daughter and her second husband.
(Friends and Family) (Recurring characters) -
Lieutenant Thomas "Tom" Beckett (David Newsom) - Sam's older brother who was killed in Vietnam on April 8, 1970, until Sam changed history and kept his brother alive. However, this resulted in Al not being rescued and being held as a prisoner of war. His first wife then believed Al to have been killed in action and moved on with another husband, not knowing that Al was trying to get back to her.
(Friends and Family) (Recurring characters) -
Katherine "Katie" Beckett (Olivia Burnette) - Sam's younger sister. To get away from trouble at home, she married an abusive alcoholic at a young age. Years later she divorced him and eventually married an Air Force officer, Lieutenant Jim Bonick. After John Beckett's death, Thelma lived with Katie and Jim.
(Friends and Family) (Recurring characters) -
Beth Calavicci (Susan Diol) - Al's first wife and the only woman he ever truly loved. When Sam meets Beth during a Season 2 leap, she believes that she is widowed as her husband, who was serving in military action in the Vietnam war, had been reported missing-in-action and presumed dead. Al pressures Sam into stopping her forming a relationship with another man, insisting that "her husband" was still alive. Sam figures out Beth's identity and refuses to fulfill Al's request, deeming it to be selfish. In his next two leaps, Sam tries to save his own brother in the Vietnam war. This accidentally thwarted a rescue attempt that would've rescued Al, causing him to become a war prisoner. When Al is freed and returns home, he learned that Beth thought he was dead and had remarried. So he chose to leave her alone. Sam is given a chance to put this right, and then assures Beth that her husband Al was alive and is trying to get back to her.
(Friends and Family) (Recurring characters) -
Sammy Jo Fuller - Sam's daughter due to his leaping. See 'Project Quantum Leap' above.
(Friends and Family) (Recurring characters) -
Captain John Beckett (Scott Bakula) - Captain John Beckett is a civil war officer and direct ancestor of Sam. Sam leaps into him, making him the only leapee to have existed outside of Sam's own time. While he represents the North, he is taken hostage by supporter of the Southern Army. Al confirms through Ziggy that his abductor is also his ancestor, and must ensure that she falls in love with the Captain. Otherwise Sam would prevent his own birth and potentially stop Project Quantum Leap from ever beginning and undoing every change Sam ever made.
(Friends and Family) (Recurring characters) -
Alia (Renée Coleman) - Sam's counterpart, a beautiful and deadly woman who is leaping around in time, committing terrible acts in an attempt to get home. Alia and Sam see each other as their respective leapees until they make physical contact. The first time Sam touches Alia, their genuine identities are revealed simultaneously. On the second occasion when they shake hands, Alia is able to see Sam but Sam still sees her as her leapee until he makes contact again. After meeting and failing to kill Sam twice, Alia abandons her old ways and tries to escape the ones controlling her leaping with Sam's help. At the end of "Revenge of the Evil Leaper" her leap is accompanied by a blue flash rather than her usual red flash, implying she has escaped the Evil Leaper project. It is implied that Alia was an unwilling participant in the project.
(Antagonists) (Recurring characters) -
Zoey (Carolyn Seymour) - Alia's holographic partner. She is a cruel and sadistic woman who, after Alia breaks free of their project's control on her, leaps back in an attempt to kill Alia herself. Unlike Sam and Al, Zoey is clearly in charge of her respective pairings. She manipulates Alia and cares little about her feelings. While Zoey is a hologram, she can see Sam if Alia can (due to her being tuned in to Alia's brainwaves), but Sam remains unable to see or hear her.
(Antagonists) (Recurring characters) -
Thames (Hinton Battle) - When Zoey leaped, a darkly comical man named Thames became her hologram.
(Antagonists) (Recurring characters) -
Lothos - The other project's computer system, analogous to Ziggy.
(Antagonists) (Recurring characters) -
Captain Thomas "Tom" Stratton (Layne Beamer) - Air Force test pilot on a program to break faster than Mach 3. Appeared in "Genesis Part 1" and first half of "Genesis Part 2".
(Season 1) (Guest characters) -
Timothy "Tim" Fox (Tim Martin) - A minor league baseball player near the end of his career. Appeared in the second half of "Genesis Part 2"
(Season 1) (Guest characters) -
Dr. Gerald Bryant (John Tayloe) - A once-respected English Lit. professor having an affair with one of his students. Appeared in "Star-Crossed".
(Season 1) (Guest characters) -
Clarence "Kid" Cody (Michael Strasser) - A professional boxer on the take from the mafia.
(Season 1) (Guest characters) -
Dr. Daniel Young (Sloan Fischer) - A large animal veterinarian in rural Texas.
(Season 1) (Guest characters) -
Frankie La Palma (Page Mosely) - A handsome Mafia hitman.
(Season 1) (Guest characters) -
Geno Frascotti (Michael Genovese) - A feared Mafia don.
(Season 1) (Guest characters) -
Jesse Tyler (Howard Matthew Johnson) - A black chauffeur/houseman to a wealthy, elderly Southern woman.
(Season 1) (Guest characters) -
Cameron Wilson (Scott Menville) - A teenaged gearhead.
(Season 1) (Guest characters) -
Nick Allen (Tony Heller) - A private investigator in love with his late partner's wife.
(Season 1) (Guest characters) -
A firefighter - A firefighter rescuing an old woman's cat from a tree.
(Season 2) (Guest characters) -
Lieutenant Thomas "Tom" McBride (Ron Chabidon) - A New York police detective on his honeymoon to Niagara Falls.
(Season 2) (Guest characters) -
Chad Stone (Kevin Light) - A professional movie stuntman.
(Season 2) (Guest characters) -
Charlie MacKenzie (Bill Arnold) - A recently discharged sailor returning home with a Japanese war bride.
(Season 2) (Guest characters) -
Samantha "Sam" Stormer (LaReine Chabut) - A professional secretary at a Detroit automotive manufacturing company.
(Season 2) (Guest characters) -
Andrew Ross (Bill Burdin) - A blind classical concert pianist.
(Season 2) (Guest characters) -
Chick Howell (Douglas Ibold) - A deejay at a rock-n-roll radio station.
(Season 2) (Guest characters) -
Rabbi David K. Basch (John J. Reiner) - A rabbi trying to guide his family through a difficult time.
(Season 2) (Guest characters) -
James "Jimmy" LaMotta ‡ (Brad Silverman) - A dockworker with Down syndrome.
(Season 2) (Guest characters) -
Leonard Dancey (Travis Michael Holder) - A lawyer defending a black woman accused of murdering her white lover.
(Season 2) (Guest characters) -
Raymond "Ray" Hutton (Michael Carl) - An actor traveling with a road show of Man of La Mancha.
(Season 2) (Guest characters) -
Dr. Timothy Mintz (Donald P. Bellisario) - A paranormal researcher investigating a possible haunting.
(Season 2) (Guest characters) -
Knut "Wild Thing" Wileton (Jeff Benson) - A college student, fraternity president and all-around party animal.
(Season 2) (Guest characters) -
Linda Bruckner (Molly Meeker) - A real estate agent and single mother.
(Season 2) (Guest characters) -
Eddie Vega (Corey Smith) - A high school football quarterback.
(Season 2) (Guest characters) -
Peter Langly (Mark Marigian) - An FBI Agent guarding a federal witness.
(Season 2) (Guest characters) -
George Washakie (Jim Jaimes) - A Native American man who is on the run with his dying grandfather.
(Season 2) (Guest characters) -
Melvin Spooner (Marvyn Byrkett) - A mortician/coroner investigating the death of a young woman.
(Season 2) (Guest characters) -
Charlie "Black Magic" Waters (Robert "Rags" Woods) - An ageing professional pool shark.
(Season 2) (Guest characters) -
Victor Panzini (Ted Nordblum) - A performer in a once-famous aerial act.
(Season 2) (Guest characters) -
"Buster" (Jay Boryea) - A bouncer helping his girlfriend kidnap a baby.
(Season 2) (Guest characters) -
Phillip Dumont (Kent Phillips) - A man trying to win back his ex-wife from her mafia fiancé.
(Season 2) (Guest characters) -
Detective Jacob "Jake" Rawlins (Doug Bauer) - A San Diego narcotics detective.
(Season 2) (Guest characters) -
Sam Beckett (Adam Affonso) - Sam's 16-year-old self.
(Season 3) (Guest characters) -
Herbert "Magic" Williams (Christopher Kirby) - Navy SEAL stationed in Vietnam.
(Season 3) (Guest characters) -
Father Frank Pistano (Bud Sabatino) - A recently ordained Catholic priest.
(Season 3) (Guest characters) -
Karl Granson (Danny McCoy, Jr.) - A professional fashion photographer.
(Season 3) (Guest characters) -
Joshua Rey (Chris Ruppenthal) - A horror novelist.
(Season 3) (Guest characters) -
Darlene Monty (Theresa Ring) - Miss Sugar Belle, a contestant in the Miss Deep South pageant.
(Season 3) (Guest characters) -
Raymond "Ray" Harper (Garon Grigsby) - A black medical school student with a white girlfriend.
(Season 3) (Guest characters) -
Harry Spontini (Dan Birch) - A professional magician fighting for custody of his daughter.
(Season 3) (Guest characters) -
Shane "Funny Bone" Thomas (Kristopher Logan) - A member of a roving motorcycle gang.
(Season 3) (Guest characters) -
Reginald Pearson (Milan Nicksic) - The personal assistant to a ruthless businessman.
(Season 3) (Guest characters) -
"Butchie" Rickett (Buff Borin) - A 13-year-old boy on vacation with his family.
(Season 3) (Guest characters) -
Billie Jean Crockett (Priscilla Weems) - A pregnant teenager estranged from her father.
(Season 3) (Guest characters) -
Kenny Sharpe (Matt Marfoglia) - An actor on the children's television series Time Patrol.
(Season 3) (Guest characters) -
Rod McCarty (Chris Solari) - A performer with the Chippendales dance company.
(Season 3) (Guest characters) -
Joey DeNardo (Sam Clay) - A lounge musician working under the name Chuck Danner.
(Season 3) (Guest characters) -
Gilbert LaBonte (Richard White) - The owner and proprietor of the LaBonte Quilting and Sewing Academy (a front for a brothel).
(Season 3) (Guest characters) -
Jeffrey "Tonic" Mole (Bruce Michael Paine) - The lead singer of a glitter rock band, King Thunder.
(Season 3) (Guest characters) -
Gordon O'Reilly (Ken Kells) - A professional bounty hunter.
(Season 3) (Guest characters) -
Jesus Ortega (Stephen Domingas) - A death row inmate.
(Season 3) (Guest characters) -
Terry Sammis (Jeff Hochendoner) - A wrestler performing under the name Nikolai Russkie.
(Season 3) (Guest characters) -
Eddie Elroy (Patrick M. Bruneau) - A college student and part-time atom bomb shelter salesman.
(Season 3) (Guest characters) -
Sam Bederman - A depression patient at a mental hospital.
(Season 3) (Guest characters) -
Captain Thomas "Tom" Jarret 1 (Dean Denton) - A recently liberated WWII prisoner of war.
(Season 4) (Guest characters) -
A stand-up comic - An entertainer working the Catskills dealing with a bitter custody hearing.
(Season 4) (Guest characters) -
Lester Fuller (Owen Rutledge) - A minor league baseball player trying to get back into the majors.
(Season 4) (Guest characters) -
Archie Necaise (Bob Hamilton) - A police deputy working in a town in the path of a hurricane.
(Season 4) (Guest characters) -
Clyde (Glenn Edden) - A civil servant and recent inductee into the Ku Klux Klan.
(Season 4) (Guest characters) -
Frank Bianca (Robert Jacobs) - A professional hairdresser born Maurice Liptschitz.
(Season 4) (Guest characters) -
Katie McBain (Cheryl Pollak) - A rape victim.
(Season 4) (Guest characters) -
Bobo (a chimpanzee) - A chimpanzee in the early stages of Project Mercury.
(Season 4) (Guest characters) -
Detective Jack Stone (David Garrison) - A police detective working on a gruesome murder investigation.
(Season 4) (Guest characters) -
William "Billy" Beaumont (Ted Baader) - A con-artist claiming that he can make rain.
(Season 4) (Guest characters) -
Chance Cole (Mark Kemble) - A prisoner being held past his sentence at a forced labor camp.
(Season 4) (Guest characters) -
Joseph "Joe" Thurlow (Will Schaub) - A young actor in a relationship with an attractive older woman.
(Season 4) (Guest characters) -
Thomas "Tommy" York (Beau Windham) - A Naval cadet under investigation for being a homosexual.
(Season 4) (Guest characters) -
Dylan Powell (Harker Wade) - An aging television reporter covering the story of a serial murder.
(Season 4) (Guest characters) -
Tyler Means (Paul Bordman) - A former Old West gunslinger with an old partner who has come looking for revenge.
(Season 4) (Guest characters) -
Cherea (Tiffany Jameson) - A member of a rhythm and blues girl group.
(Season 4) (Guest characters) -
Eddie Brackett (Mark McPherson) - The co-pilot of a small aircraft over the Bermuda Triangle.
(Season 4) (Guest characters) -
Roberto Guttierrez (Andrew Roa) - A sensationalist reporter with a bizarre talk show.
(Season 4) (Guest characters) -
Max Greenman (Ross Partridge) - A taxi driver ferrying a woman claiming to be an angel.
(Season 4) (Guest characters) -
Kyle Hart (Patrick Lowe) - A soap opera actor kidnapped by an obsessed fan.
(Season 4) (Guest characters) -
Dr. Dale Conway (Rodger LaRue) - An archeologist uncovering a cursed tomb in Egypt.
(Season 4) (Guest characters) -
Davey Parker (Rafe Battiste) - A stand-up comedian with a loud-mouthed partner.
(Season 4) (Guest characters) -
Ensign Al "Bingo" Calavicci (Jamie Walters) - A Naval pilot on trial for the murder of a superior officer's wife.
(Season 4) (Guest characters) -
Lee Harvey Oswald (Willie Garson) - An emotionally disturbed man believed to be the sole assassin of President John F. Kennedy.
(Season 5) (Guest characters) -
Clint Hill (Himself (archival photographs)) - A Secret Service agent on President Kennedy's protection detail.
(Season 5) (Guest characters) -
Nikos Stathatos (Socrates Alafouzos) - A sailor marooned on an island with a beautiful but shrewish heiress.
(Season 5) (Guest characters) -
Ronald Miller (Michael Carpenter) - A double-amputee recovering at a military hospital.
(Season 5) (Guest characters) -
Leon Stiles (Cameron Dye) - A serial killer holding a woman and her daughter hostage.
(Season 5) (Guest characters) -
Maxwell "Max" Stoddard (Douglas Stark) - An old man with a UFO fixation.
(Season 5) (Guest characters) -
James "Jimmy" LaMotta (Brad Silverman) - a previous Leapee with Down syndrome.
(Season 5) (Guest characters) -
Connie LaMotta ² (Laura Harrington) - Homemaker and sister-in-law to Jimmy LaMotta
(Season 5) (Guest characters) -
Sheriff Clayton Fuller (James Whitmore, Jr.) - Small town sheriff with a troubled but loving daughter.
(Season 5) (Guest characters) -
Deputy Sheriff William "Will" Kinman (Travis Fine) - Deputy sheriff trying to protect his fiancée from an angry mob.
(Season 5) (Guest characters) -
Lawrence "Larry" Stanton III (W.K. Stratton) - Lawyer defending a woman for the murder of her long-time aggressor.
(Season 5) (Guest characters) -
William "Willie" Walters, Jr. (Daniel Engstrom) - Part of a trio of bank robbers with a room full of hostages.
(Season 5) (Guest characters) -
Martin "Marty" Elroy - A traveling salesman with two wives and families on the verge of meeting.
(Season 5) (Guest characters) -
Margaret Sanders - A homemaker and casual participant in the Women's Liberation Movement.
(Season 5) (Guest characters) -
Dr. Ruth Westheimer (Herself) - Famous sex therapist.
(Season 5) (Guest characters) -
Lord Nigel Corrington (Robert MacKenzie) - Eccentric artist and occultist believed to be a vampire.
(Season 5) (Guest characters) -
Arnold Watkins (Tristan Tait) - A college student moonlighting as a heroic vigilante, the Midnight Marauder.
(Season 5) (Guest characters) -
Dawn Taylor ² (Raquel Krelle) - A college student dating the head of a fraternity.
(Season 5) (Guest characters) -
Elizabeth "Liz" Tate (Cynthia Steele) - A prison inmate accused of murdering another inmate.
(Season 5) (Guest characters) -
Angela Jensen ² (Laura O’Loughlin) - A prison inmate accused of murdering another inmate.
(Season 5) (Guest characters) -
Clifton Myers ³ (Sam Scarber) - The warder of a women's prison that sexually abuses the prisoners.
(Season 5) (Guest characters) -
Dennis Boardman (Stephen Bowers) - Bodyguard to Marilyn Monroe.
(Season 5) (Guest characters) -
Henry Adams (Mike Jolly) - A Vietnam veteran living in isolation in the mountains.
(Season 5) (Guest characters) -
Captain John Beckett (Rob Hyland) - Sam's ancestor fighting in the Civil War.
(Season 5) (Guest characters) -
Elvis Presley (Michael St. Gerard) - 19-year-old amateur musician on the verge of getting discovered.
(Season 5) (Guest characters)
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