Name	Known for
Fred MacMurray Steve Douglas Steve Douglas See fewer	Double Indemnity (1944)
William Demarest Uncle Charley O'Casey Uncle Charley O'Casey See fewer	Mr. Smith Goes to Washington (1939)
Don Grady Robbie Douglas / Douglas Frasier Robbie Douglas / Douglas Frasier See fewer	My Three Sons (1960)
Stanley Livingston Chip Douglas Chip Douglas See fewer	My Three Sons (1960)
Jim Henaghan Marv Marv See fewer	The Christmas Kid (1967)
Barry Livingston Ernie Thompson Douglas Ernie Thompson Douglas See fewer	Notorious Nick (2021)
Fredd Wayne Dr. Killebrew Dr. Killebrew See fewer	Man on the Moon (1999)
Walter Reed Dean of Men Dean of Men See fewer	Flying Disc Man from Mars (1950)
Sarah Selby Dean of Women Dean of Women See fewer	Tower of London (1962)
Eve McVeagh Clara Clara See fewer	High Noon (1952)
Melinda Casey Julie (as Melinda Plowman) Julie (as Melinda Plowman) See fewer	The Outer Limits (1963)
Mary Kate Denny Cynthia Cynthia See fewer	My Three Sons (1960)
Clifford Sales Letterman (as Cliff Sales) Letterman (as Cliff Sales) See fewer	Beulah (1950)
Cissy Wellman Marcia Marcia See fewer	The Outlaw Josey Wales (1976)
Jeanine Cashell Girl Girl See fewer	It's a Man's World (1962)
Mike Minor Douglas Frasier (voice) Douglas Frasier (voice) See fewer	Petticoat Junction (1963)