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Orbiting a molten lava-covered planet, the Enterprise detects improbable lifesigns. Investigating, Kirk and Spock are forced to fight alongside historical figures by rock-like aliens who want to understand the concepts of good and evil.
Ho hum, an episode about good and evil that just plods along and then is over before anything really major happens.
William Shatner as Captain Kirk
Leonard Nimoy
as Commander Spock
James Doohan
as Commander Scott
DeForest Kelley
as Doctor McCoy
Nichelle Nichols
as Lt. Uhura
George Takei
as Lt. Sulu
Walter Koenig as Ens. Chekov
Guest Cast:
Lee Bergere
Barry Atwater
Phillip Pine
Carol Daniels DeMent
Robert Herron
Nathan Jung
Written By:
Gene Roddenberry
Arthur Heinemann

Story By:
Gene Roddenberry
Directed By:
Herschel Daugherty
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