Bud Abbott as Chick Larkin

Lou Costello as Mervin Q. Milgrim

Patric Knowles as Jim Turner

Louise Allbritton as Jane Little

Mary Wickes as Juliet Collins

William Gargan as Detective Inspector Lou

William Bendix as Detective Sgt. Brannigan

Thomas Gomez as Col. J.R. Andrews

Ludwig Stössel as Dr. Anton Marek

Edmund MacDonald as 'Murder at Midnight' Announcer

Jerome Cowan as Heller

Walter Tetley as 'Shorty', a studio pageboy

Joe Kirk as Harry, 'Murder At Midnight' sound man

Don Porter as 'Murder at Midnight' program manager

Norman Abbott as 'Murder at Midnight' Organist

Abel Pina as Acrobat (uncredited)

Antonio Pina as Acrobat (uncredited)

Henry Pina as Acrobat (uncredited)

Jerry Pina as Acrobat (uncredited)

Jenaro Pina as Acrobat (uncredited)

Milton Parsons as Coroner (cameo)

Gladys Blake as Telephone Operator

Eddie Bruce as Bill, man telephoning Brazil

Billy Wayne as Jake, man telephoning Alaska

Alice Fleming as Mrs. Laffingwell, dowager telephoning Moscow

Margaret Brayton as Radio Actress (uncredited)

Crane Whitley as Radio Actor (uncredited)

Paul Dubov as Radio Actor (uncredited)

Gene O'Donnell as Radio Actor (uncredited)

Ed Emerson as Announcer (uncredited)

Buddy Twiss as Announcer (uncredited)

Edward Keane as Man in drug store touting Juliet (uncredited)

Joseph La Cava as Station Employee (uncredited)

George Ford as Station Employee (uncredited)

Jerry Frank as Customer (uncredited)

Duke York as Attendant with the Coroner (uncredited)

Harry Strang as Truck Driver (uncredited)

Bobby Barber as Test Technician in Booth (uncredited)

Chuck Hamilton as Policeman (uncredited)

Frank McLure as Acrobatic Show Spectator (uncredited)

Frank Penny as Spinelli (uncredited)