Quantum Leap is an American science-fiction television series that originally aired on NBC for five seasons, from March 1989 through May 1993. Created by Donald P. Bellisario, it starred Scott Bakula as Dr. Sam Beckett, a physicist who leaps through spacetime during an experiment in time travel, by temporarily taking the place of other people to correct historical mistakes. Dean Stockwell co-stars as Admiral Al Calavicci, Sam's womanizing, cigar-smoking companion and best friend, who appears to him as a hologram.
The series features a mix of humor, drama, romance, social commentary, and science fiction. The show was ranked #19 on TV Guide's "Top Cult Shows Ever".
Quantum Leap follows the narrative of Dr. Sam Beckett (Bakula), a physicist who has become stuck in the past as a result of a time-travel experiment gone wrong, and his attempts to return to his present, the late 20th century, by altering events in the past for the better, with the aid of a hologram of his friend Admiral Al Calavicci (Stockwell), monitoring him from Sam's present.