Larry Storch pulls double duty in this episode as both Corporal Randolph Agarn and his lookalike cousin, Mexican bandit El Diablo. In order to clear his family name, Agarn must arrest El Diablo himself--a task that proves problematic when the bandit chief invades Fort Courage and takes Captain Parmenter (Ken Berry) and Wrangler Jane (Melody Patterson) prisoner. In addition to his aforemetioned dual role, Larry Storch also shows up as three other members of the Agarn family: Granny Agarn (who looks like Whistler's Mother), Gaylord Agarn and Carmen Agarnado (Reportedly, this episode was written as a favor to actor Storch, who wanted to show off his famous flair for comic dialects). ~ Hal Erickson, Rovi