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