Quantum Leap is an American television series that was broadcast on NBC from March 1989 to May 1993. The series was created by Donald P. Bellisario, and starred Scott Bakula as Dr. Sam Beckett, a scientist who becomes lost in time following a botched experiment. Dean Stockwell co-starred as Al, Sam’s womanizing, cigar smoking sidekick and best friend. He appeared to Sam as a hologram that only Sam and a select few others could see or hear. The series features a mix of comedy, drama and melodrama, social commentary, nostalgia and sci-fi, which won it a broad range of fans. It is particularly notable for the end of each episode, where Becket leaps into his next persona (the story of the next episode), usually uttering “Oh boy”.