Season 1, Episode 27 The Alternative Factor

Kirk's investigation of an energy force takes him to a planet where he encounters Lazarus (Robert Brown), who is actually two people---one sane, one insane---from parallel universes. Barstow: Richard Derr. Lt. Charlene Master: Janet McLaghien. Kirk: William Shatner. Spock: Leonard Nimoy. Uhura: Nichelle Nichols.

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