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Star Trek The Original Series · S1E27 — The Alternative Factor
Season 1 episodes
1. The Man TrapSep 8, 1966
2. Charlie XSep 15, 1966
3. Where No Man Has Gone BeforeSep 22, 1966
4. The Naked TimeSep 29, 1966
5. The Enemy WithinOct 6, 1966
6. Mudd's WomenOct 13, 1966
7. What Are Little Girls Made Of?Oct 20, 1966
8. MiriOct 27, 1966
9. Dagger of the MindNov 3, 1966
10. The Corbomite ManeuverNov 10, 1966
11. The Menagerie: Part INov 17, 1966
12. The Menagerie: Part IINov 24, 1966
13. The Conscience of the KingDec 8, 1966
14. Balance of TerrorDec 15, 1966
15. Shore LeaveDec 29, 1966
16. The Galileo SevenJan 5, 1967
17. The Squire of GothosJan 12, 1967
18. ArenaJan 19, 1967
19. Tomorrow Is YesterdayJan 26, 1967
20. Court MartialFeb 2, 1967
21. The Return of the ArchonsFeb 9, 1967
22. Space SeedFeb 16, 1967
23. A Taste of ArmageddonFeb 23, 1967
24. This Side of ParadiseMar 2, 1967
25. The Devil in the DarkMar 9, 1967
26. Errand of MercyMar 23, 1967
27. The Alternative FactorMar 30, 1967
28. The City on the Edge of ForeverApr 6, 1967
29. Operation -- Annihilate!Apr 13, 1967
30. The CageJan 22, 1965Synopsis
Existence itself comes under threat from a man's power-struggle with his alternate self, with the Enterprise's strained dilithium crystals presenting his key to a final solution.
