Star Trek: The Animated Series, season 1, episode 5
More Tribbles, More Troubles
Summary
While the USS Enterprise escorts two robot cargo ships carrying quintotriticale, a new seed grain, to famine-stricken Sherman's Planet, it encounters a Klingon battlecruiser pursuing a Federation scout ship. When the Enterprise rescues the pilot, the Klingons attack with a new energy weapon and demand that the pilot be handed over to them.
Summary from Wikipedia, CC BY-SA 4.0.
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