Harry Morgan
Officer Bill Gannon

Jack Webb
Sergeant Joe Friday

Don Ross
Sgt. Wayne Wolfer / Tom Evans / Eugene Dickson / Sgt. Doherty / Bill Walmsley / ...

Art Balinger
Capt. Hugh Brown / Capt. Lou Richey / Capt. Ken Green / Capt. McTighe / Capt. La...

Alfred Shelly
Sgt. Al Vietti / Court Clerk (uncredited) / Detective Larson (uncredited) / Carl...

Virginia Gregg
Dallas Andrews / Lisa Ruby / Dead Drunk Wife (uncredited) / Agnes Emerson / Mrs....

John Stephenson
Narrator (voice) (uncredited)

Len Wayland
Capt. Ken Green / Off. Dave Dorman / Capt. Stanley / Capt. Morris / Jack Courtne...

Herb Vigran
Erv Fowler / John Hagen / Desk Clerk / Mr. Ferguson / Paul Woods / Al Sousa / Pe...

Art Gilmore
Capt. Lambert / Lt. Moore / Capt. Larry Walton / Capt. Merton Howe / Capt. Mert ...

Stacy Harris
Frank Baker / Clifford Ray Owens alias Barney Regal / Michael Cooper Smith / Dan...

Marshall Reed
Sgt. Hughes / Officer Whitney / Sgt. Norman Bivins / Lt. Phil Johnson / Fred Dee...

Robert Patten
Officer Young / Off. Louis J. Sale / Sgt. Jack Williams / Sgt. Joe Gunn / Sgt. T...

Anthony Eisley
Fred Wayman / Lt. Chris Drucker / Harvey Forrester / Thomas Dutcher

Howard Culver
Pete Stuart / Dr. Larry Fields / Matt Levecque / Sam Enquist

Natalie Masters
Landlady / Mrs. Ridges / Housewife

Elaine Devry
Patricia Wingate / Maggie Hinton / Irene Gorman

Eve Brent
Mrs. Fuller / Sgt. Connie Speck / Mrs. Carver

Bobby Troup
Harry Mahan / Richard Clinger / Claude Stroup

Virginia Vincent
Edie Augburn / Sally Fisher / Shirley Aldrich