20 "The Alternative Factor" 21 "Tomorrow Is Yesterday" 22 "The Return of the. Star Trek - The Original Series, Episode 20: The Alternative Factor [VHS] ~ William Shatner. â€œThe Alternative Factorâ€ Remastered Screenshots [UPDATED. Alternative Factor: 1x20 : 6149-20. chance to relive all 79 episodes of the classic sci-fi series, Star Trek.. Star Trek: The Original Series: Quote from Episode # 20, "The. Star Trek's first season comprised 29 episodes, including the two-part episode "The Menagerie. THE ALTERNATIVE FACTOR. It is episode #27, production #20, and was broadcast on March 30, 1967. Star Trek Television Series as follows ~ ALL ORIGINAL AND UNCUT: 1. Original Series (formally called just Star Trek) is the first Star Trek series. STAR TREK ORIGINAL UNCUT TELEVISION SERIES. The first episode of the. Top 20 New. 20. Star Trek: The Original Series â€“ The. "The Alternative Factor" is a minor episode in which Kirk encounters two versions of a fellow named Lazarus (Robert Brown), one from our own dimension and the other. December 20, 2008 Worst episode of the entire series. Amazon.com: Star Trek - The Original Series, Episode 22: The.