Boris KarloffDr. Bernard Adrian Maris WrixonFrances Clifford Gene O'DonnellDanny Foster Dorothy VaughanMother Clifford Henry HallSheriff Jeff Halliday Selmer JacksonDr. McNulty Gertrude HoffmannJane the Housekeeper Billy BletcherShort Mustached Posse Man George ClevelandMr. Howley Gibson GowlandPosse Member I. Stanford JolleyApe Trainer Stan JolleyBoy in Soda Shop Jack KennedyDep. Archie Tomlin Donald KerrCitizen Carrying Mauled Ape Trainer Philo McCulloughHenry Mason Richard CarrollScreenplay William T. LackeyAssociate Producer Harry NeumannDirector Of Photography Allen K. WoodAssistant Director Russell F. SchoengarthEditor Edward J. KayOriginal Music Composer Charles J. BigelowProduction Manager 
