Star Trek: The Original Series/The Alternative Factor

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The Alternative Factor
Season 1, Episode 27
Airdate March 30, 1967
Production Number 6149-20
Written by Don Ingalls
Directed by Gerd Oswald
Produced by Gene L. Coon
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The Alternative Factor is the twenty-seventh episode of the first season of Star Trek.

Starring: William Shatner (Capt. James T. Kirk)

Also Starring: Leonard Nimoy (Mr. Spock)

Guest Star: Robert Brown (Lazarus)

Featuring: DeForest Kelley (Dr. McCoy), Janet MacLachlan (Charlene Masters)

with Nichelle Nichols (Uhura), Richard Derr (Barstow), Arch Whiting (Assistant Engineer), Christian Patrick (Transporter Chief), Eddie Paskey (Lesley)


Plot Overview

Identical men from parallel universes will cause total annihilation if they meet.


Arc Advancement





The Show

Behind the Scenes

Allusions and References

Memorable Moments