An enormous space-going cloud entity feeds on the energy of whole planetary systems, and a Federation colony is next in its path. The Enterprise braves its antimatter interior and finds a way to stop it. Spock mind-melds with the entity and tells it that it is killing life, and he persuades it to return to its place of origin.
Guest Cast
Nichelle Nichols
voices Lt. Nyota Uhura
George Takei
voices Lt. Hikaru Sulu
James Doohan
voices Lt. Arex
James Doohan
voices Governor Bob WesleyCast Appearances
Leonard Nimoy
voices Spock
Episode Discussion
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