At a carnival called the Garden of Evil, a man is murdered, apparently by a gorilla...

Cameron Mitchellas Joey Matthews
Anne Bancroftas Laverne Miller
Lee J. Cobbas Detective Sgt. Garrison
Raymond Burras Cy Miller
Charlotte Austinas Audrey Baxter
Peter Whitneyas Kovacs
Lee Marvinas Shaughnessy--Policeman
Warren Stevensas Joe, Detective
John Kelloggas Morse
George Barrowsas Goliath the Gorilla (uncredited)