Quantum Leap: Season 4, Episode 22

A Leap for Lisa - June 25, 1957 (20 May 1992)

TV Episode  |  TV-PG  |   |  Action, Adventure, Drama
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While trying to save a married woman, Sam changes history and Al is sent to the gas chamber giving Sam a new observer.


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Episode cast overview:
Chip Ferguson (as Jeffrey Corbett)
Commander Hugh Dobbs
Al 'Bingo' Calavicci (as James Walters)
Lt. Lisa Sherman
Anthony Peck ...
Steve Carlisle ...
Gregory James ...
Stacker (as Jeff Nowinski)
Debbie James ...
Marci Riker (as Debbie L. James)
Ivan Gueron ...
Jack Stauffer ...
Flight Surgeon
Rich Whiteside ...
Marine Guard


Sam leaps into Al as a young Ensign accused of raping and murdering his commanding officers wife. Assuming he's there to get Al out of a jam, Sam actually changes the future when he tells his alibi not to speak to his defense lawyer. Whereas the charges were dropped originally, Ziggy says there's now an 81% chance Al will be convicted and sent to the gas chamber. The commanding officer, Dirk Riker, seems to have it in for Al, even though he knows he's innocent and knows that Al is one of the few men his wife Marci didn't sleep with. When the probability of Al being executed reaches 100%, Sam finds that Al has been replaced by Edward St. John V because Al was in fact executed. A cigar butt in Al's Corvette is all Sam needs to prove his innocence. Written by garykmcd

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Release Date:

20 May 1992 (USA)  »

Company Credits

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Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


When Al claims that Sam did not leap because he failed to save Lisa, Sam says that success has nothing to do with leaping (Al reiterates this in the following episode). Since, in nearly eighty leaps, Sam has never failed in his mission, it is unclear how he came to the determination that success is not necessary to leap.

Of course, this assumes all of Sam's leaps have been shown as episodes. As in part 2 of the first episode of the series, some leaps may have been too brief to mention. See more »


Sam: Oh, my God! I've changed history. I've killed Al.
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April Love
Written by Sammy Fain and Paul Francis Webster
Performed by Pat Boone (1957)
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