Star Trek
The Alternative Factor
Season 1, Episode 27 · Aired 1967-03-30
Synopsis
An alien named Lazarus is somehow responsible for a kind of "winking out" effect - all of reality seems on the verge of collapse. He is fleeing a monster whose intent is nothing less than the destruction of reality. But through a mishap, Kirk is transported to the home of that monster. And he looks exactly like Lazarus! Kirk must decide which of them - if either - is the monster. If he guesses wrong, it's the end of everything.
In the series
This episode is part of Star Trek (1966–1969) on NBC.
A cancelled space opera that refused to die — fandom's founding text.
Key cast
- William Shatner as Capt. James T. Kirk
- Leonard Nimoy as Spock
- DeForest Kelley as Dr. Leonard McCoy
- Nichelle Nichols as Uhura
- James Doohan as Scotty