William Powell

Lt. William 'Bill' Gordon / Anson Meridan

Rosalind Russell

Joel Carter

Binnie Barnes

Olivia Karloff

Lionel Atwill

Maj. William Brennan

Cesar Romero

Capt. Nicholas 'Nikki' Nieterstein

Samuel S. Hinds

John Carter, Assistant Secretary of War

Frank Reicher

Dr. R.A. Jackson

Charley Grapewin

Prof. Martin

Leonard Mudie

Roberts

Howard Hickman

G-Man

Murray Kinnell

de Segroff

Margaret Dumont

Mrs. Hendricks (uncredited)

Mary Forbes

Lady Cavendish (uncredited)

Tom Dugan

Agent Patrick O'Reilly (uncredited)

Bernadene Hayes

Bobbie Burns (uncredited)

Milburn Stone

Carter's Aide (uncredited)

Sidney Bracey

Jackson's Assistant (uncredited)

Edgar Dearing

1st Military Policeman (uncredited)

James Flavin

2st Military Policeman (uncredited)

Sterling Holloway

Taxi Driver (uncredited)

Mickey Rooney

Country Boy (uncredited)

Melville Cooper

Doorman (uncredited)

Bert Moorhouse

2nd Lieutenant (uncredited)

Frank Lackteen

Customs Officer in Mexico (uncredited)

Belle Mitchell

Mexican (uncredited)

Sam Ash

Mexican (uncredited)

Larry Steers

Partitioner (uncredited)

William Newell

Carter's Receptionist (uncredited)

Gino Corrado

Code Room Clerk (uncredited)

Edward Earle

Man in Code Room (uncredited)

David Burns

German-Speaking Bellhop (uncredited)

Frank O'Connor

Officer (uncredited)

Leonid Snegoff

Kaieneff (uncredited)

James P. Burtis

Private (uncredited)

Al Bridge

Sergeant (uncredited)

Eric Wilton

Kesterman (uncredited)

John Harmon

Telegrapher (uncredited)