Richard Diamond, Private Detective
Richard Diamond / Chuck Garrett
Sgt. Alden
Lt. Pete Kile / Lieutenant Kile
Lt. Dennis McGough
Paul Manners / Albert Gunther
Waldo Lattimer / Frank
Charlie Wendell / Arnie Bullock
Claire Toujours / Babs Felt
Harriet Barnes / Mindy Parker
Norman Dewitt / Walter Cummings
Sgt. Riker
Ted Anthony / Paul Schofield
Willie Gibson / Thug (uncredited)
George / Johnson
Dr. Tesla / Edna Shaw
Johnny Prescott (uncredited) / Charlie Kane
Axel / Emilio Tomas
Winifred O'Hara / Laura Renault
Joe / Bartender
Frank Bonner / Tim Wilson
Mickey Farmer / Rudi Trekhala
Warburton Flagge / Joey Kane
Stuart Simons / Gerald Clayton
Joel Finlay / Mike Gower