When war breaks out between the Federation and the Klingon Empire, the Enterprise is sent to Organia to prevent the Klingons from using the strategically-placed planet as a base. But despite Captain Kirk's appeals to the Council, the peace-loving Organians have no intention of letting the Federation plant their flag there either. Tensions mount when the Klingons arrive, until the endless bickering between Kirk and the Klingon Commander, Kor, leads the Organians to put their foot down and stage a galactic intervention. Just as he did with his stellar teleplay for "A Taste of Armageddon," writer-producer Gene Coon disguises his allegory about the pointlessness of war as a provocative, superbly-written and powerfully-acted science fiction action-adventure. But of course, "Errand of Mercy" truly achieves landmark status by being the first "Star Trek" episode to feature the Klingons, and guest star John Colicos gave a magnificent performance that set the standard for every Klingon that followed over the last 55 years.

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