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Over the protests of the Cartwrights, the Carttlemen's Association hires range detective Marcus Alley (Albert Salmi) to round up a gang of rustlers by any means necessary. Unfortunately, Alley is a psycho who shoots first and asks questions later-and as a result, several innocent people are killed. Also in the cast are Richard Carlson as Hollenbeck, Kenneth Tobey as Heath, Anna Navarro as Prudence and Myron Healey as Johannsen. First shown on January 21, 1968, "The Thirteenth Man" was written by Walter Black.