The Flash - Season 1 - Eps 18: Twin Streaks
A scientist and his business partner are trying to develop a being with super speed, their attempts fail. They manage to clone the Flash. Their creation learns quickly, but is emotional moral equivalent of a child. Barry must stop his twin.
About The Flash

Title: The Flash
First Air Date: 1990-09-20
Last Air Date: 1991-05-18
Status: Canceled
Rating: 7.4/10 (from 502 votes)
Language: EN
Seasons: 1
Total Episodes: 22
Network: CBS
Genres: Action & Adventure, Crime, Drama, Sci-Fi & Fantasy
Production Companies: Warner Bros. Television, Pet Fly Productions
Synopsis
When a bolt of lightening crashes through a police crime lab, a mix of electrically charged substances bathes chemist Barry Allen, transforming him into the fastest man alive--The Flash.
Cast

John Wesley Shipp
Barry Allen / Flash

Amanda Pays
Christina 'Tina' McGee

Alex Désert
Julio Mendez