Star Trek: The Animated Series
The Practical Joker
S02E03 - Airdate: 1974-09-21
Runtime: 30 min
After avoiding a Romulan ambush by three of their warships, the U.S.S. Enterprise enters a strange energy cloud. The gaseous cloud affects the ship's computer turning it insane. With the crew at the mercy of the Enterprise 's computer, it indulges in a series of increasingly aggressive practical jokes.
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Episode details and rating from TVmaze.