|Created by||Donald P. Bellisario|
|Theme music composer||Mike Post|
|Composer||Velton Ray Bunch|
|Country of origin||United States|
|No. of seasons||5|
|No. of episodes||97 ( list of episodes)|
|Running time||45 minutes|
|Distributor||NBCUniversal Television Distribution|
|Original release||March 26, 1989 –|
May 5, 1993
|Followed by||Quantum Leap (2022 TV series)|
Quantum Leap is an American science fiction television series, created by Donald P. Bellisario, that premiered on NBC and aired for five seasons, from March 26, 1989, to May 5, 1993. The series stars Scott Bakula as Dr. Sam Beckett, a physicist who involuntarily leaps through spacetime during experiments in time travel, by temporarily taking the place of other people to correct what he consistently discovers were historical mistakes.
A revival series was ordered by NBC, which premiered on September 19, 2022.
In the near future, physicist Dr. Sam Beckett (Bakula) theorizes that time travel within one's own lifetime is possible, and obtains government support to build his project "Quantum Leap". Some years later, having already spent $43 billion, the government threatens to halt funding, as no progress has been made, and Sam decides to test the project accelerator by himself to save the project before anyone can stop him. He is thrown back in time, and on regaining consciousness, finds that while he physically exists in the past, he appears to everyone else as a person into whom he had "leapt", and further has partial amnesia related to his own identity.    
A hologram of his friend Admiral Al Calavicci (Stockwell) appears, visible and audible only to Sam, and helps to explain to Sam that he must correct something that went wrong in the past, aided with the resources of the project's supercomputer Ziggy, the self-aware artificial intelligence " parallel hybrid computer with an ego." Despite successfully correcting the past, Sam continues to leap, seemingly "guided by an unknown force", to another place and time within his own lifetime, "putting right what once went wrong and hoping each time that his next leap will be the leap home".    
Sam has six doctoral degrees, a black belt in kung fu, a photographic memory, and near-virtuosic musical talent, allowing him to easily slip into the shoes of many different people. The bookish and naive Sam is a sharp contrast to his best friend Al, a womanizing, cigar-smoking five-time divorcé who grew up in an orphanage, was active in the civil rights movement, and was a prisoner of war in Vietnam.
Sam and Al are the only characters to appear in every episode. The supporting characters of each episode are the friends, family, and acquaintances of the person Sam has leapt into. With a few exceptions such as two-part or sequel episodes, these characters only appear once, though several actors have played multiple characters. Occasionally, Sam will also run into real-life historical figures such as Buddy Holly, Michael Jackson, Donald Trump, Marilyn Monroe, and Ruth Westheimer, the latter of which played herself.
The other members of the Quantum Leap team are mentioned often and each appear in a handful of episodes. They include Irving "Gooshie" Gushman ( Dennis Wolfberg), the project's head programmer, Dr. Verbena Beeks (Candy Ann Brown), the project's psychiatrist, Tina Martinez ( Gigi Rice), the project's medical technician and Al's lover, and Dr. Donna Eleese ( Teri Hatcher/ Mimi Kuzyk), Sam's wife and the project's director in his absence.
The main premise for Quantum Leap was inspired by such movies as Here Comes Mr. Jordan (1941) and Heaven Can Wait, as well as the 1960s TV show The Time Tunnel. Series creator Donald P. Bellisario   saw its concept as a way of developing an original anthology series, as anthologies were unpopular with the networks. 
The theme for the series was written by Mike Post.  It was later rearranged for the fifth season, except for the series-finale episode, which featured the original theme music. Scores for the episodes were composed by Post and Velton Ray Bunch.
A soundtrack album was first released in 1993, titled Music from the Television Series 'Quantum Leap' , dedicated to John Anderson, who played Pat Knight in The Last Gunfighter. It was released by GNP Crescendo on CD and cassette tape.
|1||Prologue (Saga Sell)||Mike Post, Velton Ray Bunch, Deborah Pratt (voiceover)||1:05|
|2||Quantum Leap (Main Title)||Mike Post||1:15|
|3||Somewhere in the Night||Scott Bakula||3:32||Piano Man|
|4||Suite from the Leap Home||Velton Ray Bunch||3:37||The Leap Home, Part 1|
|5||Imagine||John Lennon||3:05||The Leap Home, Part 1|
|6||Sam's Prayer||Velton Ray Bunch||1:52||A Single Drop of Rain|
|7||Blue Moon of Kentucky||Bill Monroe||1:41||Memphis Melody|
|8||Baby, Let's Play House||Arthur Gunter||2:13||Memphis Melody|
|9||Shoot Out||Velton Ray Bunch||3:03||The Last Gunfighter|
|10||Medley from Man of La Mancha||Scott Bakula||6:18||Catch a Falling Star|
|11||Bite Me||Velton Ray Bunch||3:29||Blood Moon|
|12||Alphabet Rap||Dean Stockwell||2:05||Shock Theater|
|13||Suite from "Lee Harvey Oswald"||Velton Ray Bunch||14:55||Leaping on a String|
|14||Fate's Wide Wheel||Scott Bakula||3:05||Glitter Rock|
|15||A Conversation with Scott Bakula||Scott Bakula (interview)||12:02|
|16||Quantum Leap (Prologue and Main Title Reprise)||Mike Post, Velton Ray Bunch||2:20|
The Quantum Leap series was initially moved from Friday nights to Wednesdays. It was later moved twice away from Wednesdays to Fridays in late 1990, and to Tuesdays in late 1992. The series finale aired in its Wednesday slot in May 1993. 
The most frequent time slot for the series is indicated by italics:
- Sunday at 9:00–11:00 pm on NBC: March 26, 1989
- Friday at 9:00–10:00 pm on NBC: March 31, 1989 – April 21, 1989
- Wednesday at 10:00–11:00 pm on NBC: May 3—17, 1989; September 20, 1989 – May 9, 1990; March 6, 1991 – May 20, 1992
- Friday at 8:00–9:00 pm on NBC: September 28, 1990 – January 4, 1991
- Tuesday at 8:00–9:00 pm on NBC: September 22, 1992 – April 20, 1993
- Wednesday at 9:00–10:00 pm on NBC: May 4, 1993
In the United Kingdom, the show began on BBC Two on February 13, 1990,  airing Tuesday evenings at 9:00 pm. The final episode was scheduled to be aired on June 14, 1994, but altered schedules after the death of British dramatist Dennis Potter earlier that month delayed the airing until June 21, 1994.  Repeat episodes continued on the channel at various times until December 28, 1999. 
During the summer of 1990, NBC scheduled a "Quantum Leap Week". Over the course of five consecutive nights, repeat episodes of the show were broadcast in an effort to drum up interest in the fledging series.  The "Quantum Leap Week" was repeated during the summer of 1991. Each of the weekly events was supported by a series of advertisements. In each were a series of " man-on-the-street" attempting to say "Quantum Leap Week" fast, with varied levels of success.  
Universal Studios has released the entire, digitally remastered, Quantum Leap series on DVD.   Some controversy arose when fans discovered that many songs had been replaced from the soundtrack due to music rights issues. For the fifth season, Universal included all of the original music. 
On April 13, 2016, Mill Creek Entertainment announced that it had acquired the rights to the series and re-released the first two seasons on DVD on June 7, 2016. 
On February 7, 2017, Mill Creek re-released Quantum Leap - the Complete Series on DVD and also released the complete series on Blu-ray for the first time.  The 18-disc set contains all 97 episodes of the series, as well as most of the original music restored for all seasons.
|Season - DVD name||Episodes||DVD release date|
|Region 1||Region 2||Region 4|
|Season 1 - The Complete First Season||9||June 8, 2004||November 8, 2004||May 2, 2005|
|Season 2 - The Complete Second Season||22||December 14, 2004||October 31, 2005||February 7, 2006|
|Season 3 - The Complete Third Season||22||May 10, 2005||December 12, 2005||June 7, 2006|
|Season 4 - The Complete Fourth Season||22||March 28, 2006||June 26, 2006||November 2006|
|Season 5 - The Complete Fifth Season||22||November 14, 2006||December 26, 2006||February 21, 2007|
|Seasons 1–5 - The Complete Series
(The Complete Collection)
|97||November 4, 2014 ||October 8, 2007 ||N/A|
At the end of season five, Bellisario was told to write an episode that could serve as a season finale or series finale, as it was unclear whether Quantum Leap would be renewed. The episode contained some answers to long-standing questions about the show, but contained enough ambiguity for a season six. When the show was not renewed, two title cards were tacked on to the end of the last episode; one read that Al's first wife Beth never remarried, so they were still married in the present day and had four daughters. The last title cards said "Sam Becket [sic] never returned home." The finale was met by viewers with mixed feelings.   
A few years[ when?] after the airing of the finale, a script for an alternate ending was leaked on the internet. It implied that Al, through encouragement of his wife Beth, would become a leaper to go after Sam and that they would be leaping into the future. Bellisario has said no script exists and that he does not know where this idea came from. In 2018, however, fan Allison Pregler purchased title cards taken from season five that contained some shots of Al and Beth together; this implies that part of the alternate ending was, in fact, shot and gives credibility to the alternate-ending scenario.   In May 2019, a video of the lost footage was uploaded to Reddit by a contributor with the handle Leaper1953.  How this person obtained the footage is not known publicly. Scott Bakula confirmed that several endings were shot and that the footage was authentic. 
The series had a slow start in the ratings, and its timeslot was moved often, but it did well in the 18–49 demographic. The finale was viewed by 13 million American households.  In 2004 and 2007, Quantum Leap was ranked number 15 and 19, respectively, on TV Guide's "Top Cult Shows Ever". 
- Barrett, Julie, The A–Z of Quantum Leap. Boxtree Ltd., London 1995. ISBN 0-7522-0628-1
- Chunovic, Louis, Quantum Leap Book. Boxtree Ltd., London 1993. ISBN 1-85283-866-3
- Schuster, Hal, The Making of Quantum Leap. HarperCollins, London 1996. ISBN 0-06-105438-0
- Dale, Matt, Beyond the Mirror Image. TME Books, UK 2017. The limited edition first print hardcover was funded via Kickstarter in late 2016 and included both black & white and colored pages. Due to popular demand, the book was reprinted, though the 2nd edition did not include colored pages and came with a book jacket/dust cover.
- Robitaille, Julie, The Beginning. Transworld Publishers|Corgi, London 1990. ISBN 0-552-13642-5. Re-published in U.K. by Boxtree Ltd., London 1994. ISBN 1-85283-392-0. (Novelization of the pilot episode)
- Robitaille, Julie, The Ghost and the Gumshoe. Corgi, London 1990. ISBN 1-85283-397-1. Re-published in U.K. by Boxtree Ltd., London 1994. (Novelization of "Play It Again, Seymour" and "A Portrait of Troian")
- McConnell, Ashley, Quantum Leap: The Novel. Ace Books, 1992. ISBN 0-441-69322-9. Re-published in the UK as Carny Knowledge. Boxtree Limited, London 1993. ISBN 1-85283-871-X
- McConnell, Ashley, Too Close for Comfort. Ace Books, 1993. ISBN 0-441-69323-7.
- McConnell, Ashley, The Wall. Ace Books, 1994. ISBN 0-441-00015-0.
- McConnell, Ashley, Prelude. Ace Books, 1994. ISBN 0-441-00076-2.
- Melanie Rawn: Knights of the Morningstar. Ace Books, 1994. ISBN 0-441-00092-4.
- Melissa Crandall: Search and Rescue. Ace Books, 1994. ISBN 0-441-00122-X.
- McConnell, Ashley, Random Measures. Ace Books, 1995. ISBN 0-441-00182-3.
- Storm, L. Elizabeth, Pulitzer. Boulevard, 1995. ISBN 1-57297-022-7.
- Henderson, C.J. and Laura Anne Gilman, Double or Nothing. Boulevard, 1995. ISBN 1-57297-055-3.
- Walton, Barbara E., Odyssey. Boulevard, 1996. ISBN 1-57297-092-8.
- Peel, John, Independence. Boulevard, 1996. ISBN 1-57297-150-9. Re-published in the U.K. as Leap into the Unknown. Boxtree Ltd., London 1996 ISBN 0-7522-0137-9.
- Storm, L. Elizabeth, Angels Unaware. Boulevard, 1997. ISBN 1-57297-206-8.
- Davis, Carol, Obsessions. Boulevard, 1997. ISBN 1-57297-241-6.
- Schofield, Sandy ( Dean Wesley Smith and Kristine Kathryn Rusch), Loch Ness Leap. Boulevard, 1997 ISBN 1-57297-231-9.
- Kent, Melanie, Heat Wave. Boulevard, 1997 ISBN 1-57297-312-9.
- DeFilippis, Christopher, Foreknowledge. Boulevard, 1998 ISBN 0-425-16487-X.
- Peterman, Mindy, Song And Dance. Boulevard, 1998 ISBN 0-425-16577-9.
- Davis, Carol, and Esther D. Reese: Mirror's Edge. Boulevard, 2000 ISBN 0-425-17351-8.
Innovation Publishing produced a series of comic books that ran for 13 issues from September 1991 through August 1993. As with the television series, each issue ended with a teaser preview of the following issue and Sam's exclamation of "Oh, boy." Among the people into whom Sam found himself leaping in this series were: 
|1||"First There Was a Mountain, Then There Was No Mountain, Then There Was"||High school teacher named Karen Connors in Memphis, Tennessee||March 25, 1968|
|2||"Freedom of the Press"||Death row inmate named Willie Jackson, who must prevent a murder on the outside||June 11, 1962|
|3A||"He Knows If You've Been Bad or Good ..."||Part-time Santa Claus, who goes by the name of Nick||December 20, 1963|
|3B||"The Infinite Corridor"||Student at MIT named Matt Randall, who is researching quantum physics||April 2, 1968|
|4||"The 50,000 Quest"||Contestant amid the quiz show scandals||August 15, 1958|
|5||"Seeing is Believing"||Newspaper reporter/columnist, who responds to a girl seeing a UFO||November 14, 1957|
|6||"A Tale of Two Cindys"||Teenaged girl with an identical twin sister||February 12, 1959|
|7A||"Lives on the Fringe"||Professional golfer with the Mafia after him||1974|
|7B||"Sarah's Got a Gun"||Bus driver, who discovers child abuse||May 19, 1953|
|8||"Getaway"||Bank robber, while the leapee tours the project with Al||1958|
|9||"Up Against a Stonewall"||Sequel to " Good Night, Dear Heart": Stephanie Heywood is released from prison after serving 12 years for manslaughter.||June 22, 1969|
|10||"Too Funny For Words"||Stand-up comedian, who befriends a fading silent movie star||June 13, 1966|
|11||"For the Good of the Nation"||Doctor studying the effects of LSD on human subjects||July 1958|
|12||"Waiting"||Gas-station attendant with a lot of time on his hands||April 24, 1958|
|13||"One Giant Leap"||An extraterrestrial aboard an orbiting spaceship||June 5, 1963|
|||"Two Dweebs and a Little Monster"||Not published|
Few of the comic stories referenced episodes of the television series, with the exception of the ninth issue, "Up Against a Stonewall".
In July 2002, the Sci-Fi Channel (which at the time was airing reruns of the show) announced development of a two-hour television film based on Quantum Leap that would have served as a backdoor pilot for a new series, with Bellisario as executive producer. 
In July 2010 during the TV Guide panel at the San Diego Comic-Con International, Scott Bakula said that Bellisario was working on a script for a projected Quantum Leap feature film.  Bellisario confirmed in October 2017 at the L.A. Comic Con that he had finished the script. 
In January 2022, NBC greenlit a pilot episode of a Quantum Leap sixth season revival. Bellisario is involved, while the showrunners include Steven Lilien and Bryan Wynbrandt, with Deborah Pratt and Martin Gero as executive producers. The pilot will take place 30 years after the conclusion of the original series, with a new team reviving Project Quantum Leap to understand both it and the fate of Sam Beckett.  Raymond Lee was signed to star in the pilot in the role of Dr. Ben Song, the person that ends up traveling back in time through the Quantum Leap project.  Ernie Hudson was cast as Herbert "Magic" Williams, the lead of the new Quantum Leap program and a Vietnam War veteran whom Sam leaped into in the season three episode "The Leap Home (Part 2) – Vietnam".  NBC gave the green light for a full season order in May 2022.  In July 2022, it was announced that Dean Georgaris joined as showrunner.  It premiered on September 19, 2022, airing on Monday nights.  
In September 2022, original series star Scott Bakula confirmed that he had been asked by producers to reprise his role as Sam Beckett in the revival, but ultimately decided to not be involved with the new series, saying in a statement on Instagram, "As the show has always been near and dear to my heart, it was a very difficult decision to pass on the project". 
Source Code, a 2011 science-fiction action thriller film, was directed by Duncan Jones. Jones said in reading its script that he was reminded of Quantum Leap and as a reference to the show, cast Bakula in a voice cameo role, including giving him one line of "Oh, boy" in the script. 
Special episodes of Star Trek: Enterprise (" Detained", 2002) and NCIS: New Orleans (" Chasing Ghosts", 2014), both series that featured Bakula as lead, included Stockwell as a guest star to reunite the two actors from Quantum Leap. Further, "Chasing Ghosts" was directed by James Whitmore Jr., who had directed 15 episodes, and acted in three episodes, of Quantum Leap. 
The 2017 episode " The Gang Turns Black" of the series It's Always Sunny in Philadelphia features numerous Quantum Leap references. When the gang finds themselves in different bodies, Sweet Dee suggests that they are "quantum leaping". Bakula has a guest appearance, as himself, researching an upcoming role. 
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