Lorne Greene Ben Cartwright Actor Michael Landon Little Joe Cartwright Actor Dan Blocker Eric "Hoss" Cartwright Actor Pernell Roberts Adam Cartwright Actor Inga Swenson Guest Star Jeremy Slate Guest Star James Philbrook Guest Star Harlan Wade Guest Star Johnny Stephens Guest Star Taggert Casey Guest Star Charles Fredericks Guest Star Helen Brown Guest Star Nolan Leary Guest Star James W. Lane Executive Producer David Dortort Producer, Writer Frank Cleaver Writer Anthony Lawrence Writer Lewis Allen Director