Errand of Mercy
Star Trek: The Original Series: Season 1, Episode 26
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The Federation, in a desperate attempt to thwart an invasion by the warring Klingon Empire, sends the Enterprise to Organia to offer protection.
Writer: Gene L. Coon
Air date: March 23, 1967
Directed by: John Newland
Episode no: Season 1; Episode 26
Featured music: Alexander Courage
Production code: 026