Season 1, Episode 26 Errand of Mercy

A peace-loving race gives Kirk a lesson in warfare when they hesitate to interfere in a skirmish between the Federation and Klingons that threatens their planet. John Colicos reprised his role as the Klingon Kor in the “Star Trek: Deep Space Nine” episodes “Blood Oath,” “Once More Into the Breach” and “The Sword of Kahless.” Ayelborne: John Abbott. Kor: John Colicos. Spock: Leonard Nimoy. Claymare: Peter Brocco. Sulu: George Takei.

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