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Star Trek: S1 E19
Tomorrow Is Yesterday
The Enterprise collides with a black hole and is thrown back to Earth in the 20th century, where they must find a way back and erase any trace of their presence. Matters become complicated when they rescue an Air Force pilot and cannot return him without changing history…but if he disappears that will change history as well.
S1 - E1The Man Trap Sep. 08, 1966
S1 - E2Charlie X Sep. 15, 1966
S1 - E3Where No Man Has Gone Before Sep. 22, 1966
S1 - E4The Naked Time Sep. 29, 1966
S1 - E5The Enemy Within Oct. 06, 1966
S1 - E6Mudd's Women Oct. 13, 1966
S1 - E7What Are Little Girls Made Of? Oct. 20, 1966
S1 - E8Miri Oct. 27, 1966
S1 - E9Dagger of the Mind Nov. 03, 1966
S1 - E10The Corbomite Maneuver Nov. 10, 1966
S1 - E11The Menagerie (1) Nov. 17, 1966
S1 - E12The Menagerie (2) Nov. 24, 1966
S1 - E13The Conscience of the King Dec. 08, 1966
S1 - E14Balance of Terror Dec. 15, 1966
S1 - E15Shore Leave Dec. 29, 1966
S1 - E16The Galileo Seven Jan. 05, 1967
S1 - E17The Squire of Gothos Jan. 12, 1967
S1 - E18Arena Jan. 19, 1967
S1 - E19Tomorrow Is Yesterday Jan. 26, 1967
S1 - E20Court Martial Feb. 02, 1967
S1 - E21The Return of the Archons Feb. 09, 1967
S1 - E22Space Seed Feb. 16, 1967
S1 - E23A Taste of Armageddon Feb. 23, 1967
S1 - E24This Side of Paradise Mar. 02, 1967
S1 - E25The Devil in the Dark Mar. 09, 1967
S1 - E26Errand of Mercy Mar. 23, 1967
S1 - E27The Alternative Factor Mar. 30, 1967
S1 - E28The City on the Edge of Forever Apr. 06, 1967
S1 - E29Operation: Annihilate! Apr. 13, 1967