<Tr> <Th_colspan="2"> External links </Th> </Tr> <Tr> <Th> Website (NBC) </Th> <Td> www.nbc.com/classic-tv/quantum-leap </Td> </Tr> <P> 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 . </P> <P> The series features a mix of humor, drama, romance, social commentary, and science fiction, and was named one of TV Guide's "Top Cult Shows Ever". </P>

How many seasons of quantum leap are there