Richard Diamond, Private Detective

David Janssen

Richard Diamond / Chuck Garrett

Richard Devon

Sgt. Alden

Russ Conway

Lieutenant Kile

Regis Toomey

Lt. Dennis McGough

Peter Leeds

Waldo Lattimer

Bartlett Robinson

Clifton

Robert Quarry

Charlie Wendell

Peggy Maley

Babs Felt

Michael Fox

Paul Schofield

Patricia Donahue

Harriet Barnes

Ross Elliott

Walter Cummings

Bill Erwin

Sgt. Riker

Richard Reeves

Willie Gibson

Herb Vigran

George

Jeanette Nolan

Dr. Tesla

William Schallert

Charlie Kane

Nestor Paiva

Axel

Hillary Brooke

Laura Renault

Joe Conley

Joe

Peter Hansen

Frank Bonner

Christopher Dark

Mickey Farmer

Lawrence Dobkin

Joey Kane

Frank Albertson

Gerald Clayton

Gordon Jones

Joel Finlay

Sandy Kenyon

Lt. Harry Baker

Ellen Corby

Miss Carter

Jack Elam

Danny Boy

James Hong

Young Man

Gloria Winters

Dixie Moore

Bethel Leslie

Harriet Morrow

John Hoyt

Burnison

Charles Aidman

Joe Vale

DeForest Kelley

Kenneth Porter

Eleanor Audley

Mrs. Deneken

Ross Martin

Nate Muro

Arthur Batanides

Wally

Barbara Pepper

Clara Chase

Chris Alcaide

First Thug

Vic Perrin

Smith

Osa Massen

Janet Morrisey