James Arness Marshal Matt Dillion Actor Milburn Stone Dr. Galen "Doc" Adams Actor Ken Curtis Festus Guest Star Buck Taylor Newly Guest Star Ned Beatty Karp Guest Star Mitch Vogel Dink Guest Star Lee de Broux Quincannon Guest Star Robert Donner Belnap Guest Star Damon Douglas Billy Guest Star Sierra Bandit Martha Guest Star Ellen Blake Mrs. Belnap Guest Star Leonard Katzman Producer Paul Savage Writer Victor French Director