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Marshal Matt Dillon (James Arness) welcomes his old friend Hack Prine (Leo Gordon) to Dodge City. What Dillon doesn't know is that Hack is now a hired killer--and his latest assignment is to gun down Matt, so that Dolph Trimble (George D. Wallace) can help his outlaw brother Lee (Hal Baylor) bust out of jail. When Matt finally figures out what Hack is planning to do, he is faced with one of the biggest moral dilemmas of his life. This episode is adapted from the Gunsmoke radio broadcast of July 5, 1952.