Fred MacMurray

Trooper Ross Martin

Ann Sheridan

Mary Adams

Guy Standing

John Vilker, alias Prof. Anthony

Marina Koshetz

Nan Vilker

Dean Jagger

Trooper Jim Burton

William Frawley

Training Sgt. Barrel

Frank Craven

Sheriff Peter Arnot

Nora Cecil

Granny Adams

Charles C. Wilson

Trooper Captain Ryan

Joe Sawyer

Whitey, burly henchman

Mack Gray

Smoke, thin henchman

Eddy Chandler

Trooper Haynes, Car 45

Robert Kent

Trooper Blatzky

John Howard

Trooper Carney

Alfred Delcambre

Trooper Jamison

Howard Wilson

Dutch

Hector V. Sarno

French Charley

Eddie Dunn

Mack

Jack Cheatham

Radio Sgt. Meyers

Russell Hopton

Dispatch Operator Harper