James Arness Marshal Matt Dillion Actor Milburn Stone Dr. Galen "Doc" Adams Actor Buck Taylor Newly Actor Victor French Sheriff Bo Harker Guest Star, Director Ken Curtis Festus Guest Star Harry Morgan Jed Hockett Guest Star Ted Jordan Nathan Burke Guest Star Strother Martin Ben Snow Guest Star Harold Gould Lucius Shindrow Guest Star William Watson Gard Dixon Guest Star Herman Poppe Luke Guest Star Dorothy Tristan Lyla Guest Star Richard Anderson Coltrain Guest Star Michele Marsh Sarah Guest Star Dennis Redfield Shep Guest Star James Luisi Ivers Guest Star Linda Sublette Emily Guest Star John Crawford Muller Guest Star Fran Ryan Hannah Guest Star Robert Brubaker Floyd Guest Star Leonard Katzman Producer, Director Jim Byrnes Writer Earl W. Wallace Writer Paul Savage Writer Arthur Dales Writer William Putnam Writer John Mantley Executive Producer, Writer Roy Goldrup Writer Ron Bishop Writer William Keys Writer Robert Vincent Wright Writer Gunnar Hellström Director Bernard McEveety Director Michael O'Herlihy Director Vincent McEveety Director