Cornel Wilde Leonard Diamond Jean Wallace Susan Lowell Brian Donlevy Joe McClure Richard Conte Mr. Brown Lee Van Cleef Fante Earl Holliman Mingo Robert Middleton Police Capt. Peterson Helen Walker Alicia Brown Jay Adler Detective Sam Hill John Hoyt Nils Dreyer Ted de Corsia Ralph Bettini Helene Stanton Rita Roy Gordon Audubon Baynes Barron Young detective James McCallion Frank - Lab technician Tony Michaels Photo technician Rita Gould Nurse Bruce Sharpe Detective Michael Mark Fred (hotel clerk) Donna Drew Miss Hartleby Joseph H. Lewis Director John Alton Director