Gabriel Dell as Malcolm

Will Geer as Dr. Simpson

Barbara Harris as Miss Helen Fredericks

Anjanette Comer as Arlevia Jessup

Joyce Van Patten as Ida Mae

Richard Gautier as Oscar Cornell

Nita Talbot as Jasmine Cornell

Vincent Gardenia as Big Daddy Jessup

Jackie Coogan as Detective Chief Anderson

Sorrell Booke as Dr. Melon

Huntz Hall as Deputy Roy

Nicholas Colasanto as Bert