1.29 Operation -- Annihilate!

Arriving at planet Deneva, the Enterprise crew discover the population has been devastated by large, amoeba-like aliens that attack humans and intertwine themselves with the body's nervous system.

Operation -- Annihilate!
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TOS Season 1, Episode 29

WRITTEN BY
Steven W. Carabatsos
DIRECTED BY
Herschel Daugherty

First Aired Apr 13, 1967
Stardate 3287.2