Star Trek: The Original Series
Errand of Mercy
S1 E26:
In the first episode to feature the Klingons, Kirk and Spock intervene to offer protection to the people of a planet caught dangerously between the Empire and the Federation. But the seemingly lethargic Organians turn out to have a few surprises of their own.
Starring
John Abbott, John Colicos, Peter Brocco