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The Flash: S1 E18
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.
S1 - E1Pilot Sep. 20, 1990
S1 - E2Out of Control Sep. 27, 1990
S1 - E3Watching the Detectives Oct. 18, 1990
S1 - E4Honor Among Thieves Oct. 25, 1990
S1 - E5Double Vision Nov. 01, 1990
S1 - E6Sins of the Father Nov. 08, 1990
S1 - E7Child's Play Nov. 15, 1990
S1 - E8Shroud of Death Nov. 29, 1990
S1 - E9Ghost in the Machine Dec. 13, 1990
S1 - E10Sight Unseen Jan. 10, 1991
S1 - E11Beat the Clock Jan. 31, 1991
S1 - E12The Trickster Feb. 07, 1991
S1 - E13Tina, Is That You? Feb. 14, 1991
S1 - E14Be My Baby Feb. 21, 1991
S1 - E15Fast Forward Feb. 27, 1991
S1 - E16Deadly Nightshade Mar. 30, 1991
S1 - E17Captain Cold Apr. 06, 1991
S1 - E18Twin Streaks Apr. 13, 1991
S1 - E19Done with Mirrors Apr. 27, 1991
S1 - E20Good Night, Central City May. 04, 1991
S1 - E21Alpha May. 11, 1991
S1 - E22The Trial of the Trickster May. 18, 1991