"Errand of Mercy" is one of this reviewer's favorite. Indeed, guest star John Colicos, who plays the series' first Klingon commander, took the part because of the excellent script. The episode involves the Enterprise being sent to peaceful Organia to prevent the Klingons from using it as a strategic location in its expansion and enslaving its apparently primitive and non-violent inhabitants. However, instead of accepting Kirk's offer of help to prevent a Klingon take-over the Organians don't appear to be the least bit interested, to the consternation of Kick and Spock. Meanwhile, in space the Federation and the Klingon Empire prepare for all out war, paralleling Nazi Germany's expansion and the US being drawn into WW II. In true TOS fashion, the plot twists take you on a merry roller-coaster ride, each more fantastic than the last. Colicos' role as the Klingon Commander is superbly acted, portraying the ruthlessness and violent nature of the Klingons. Mr. Colicos was supposed to appear in that role in future episodes, but was unfortunately unable to due to other acting obligations. A tight script and surprise ending make "Errand of Mercy" one the TOS best.
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