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episode title: Leap for Lisa - June 25, 1957, A

Air date: 1992-05-20

episode lenght: 48 minutes

While trying to save a married woman, Sam changes history and Al is sent to the gas chamber giving Sam a new observer. (source imdb)

IMDB rating: 8.5

This exact episode (4/22): imdb number tt681098

Scott Bakula => imdb link: nm0000836
Dean Stockwell => imdb link: nm0001777
Charles Rocket => imdb link: nm0734236
Jeff Corbett => imdb link: nm0179167
Larry Brandenburg => imdb link: nm0104594
Jamie Walters => imdb link: nm0910256
Terry Farrell => imdb link: nm0000395
Anthony Peck => imdb link: nm0669625
Roddy McDowall => imdb link: nm0001522
Steve Carlisle => imdb link: nm0137652
Jeff Nowinski => imdb link: nm0637454
Debbie James => imdb link: nm0416415
Ivan Gueron => imdb link: nm0345973
Jack Stauffer => imdb link: nm0823923
Rich Whiteside => imdb link: nm0925892
Mia Drake => imdb link: nm1038325
Deborah Pratt => imdb link: nm0695445

Most of the info found on this page was found on imdb