One of Our Planets Is Missing

S01E03 - Airdate: 1973-09-22

* 8.7/10

Runtime: 30 min

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.

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Episode details and rating from TVmaze.