Cuthbert Greenway / Dr. Ralph Greenway

Bud Abbott

Horatio Prim

Lou Costello

Melody Allen

Marjorie Reynolds

Sheldon Gage

John Shelton

Mildred Dean

Binnie Barnes

Emily

Gale Sondergaard

Thomas Danbury

Jess Barker

June Prescott

Lynn Baggett

Maj. Putnam

Robert H. Barrat

Maj. Putnam

Robert Barrat

Lt. Mason

Donald MacBride

Nora O'Leary

Ann Gillis

Sergeant Connors

William Hall

Sgt. Makepeace

Rex Lease

Mr. Dibbs (uncredited)

Selmer Jackson

Dandy at Party (uncredited)

Kirk Alyn

Bates

Walter S. Baldwin

Second Sergeant (uncredited)

Harry Brown

Leigh - Traitor (uncredited)

Vernon Downing

Bessie - Danbury's Maid (uncredited)

Marjorie Eaton

Museum Guard (uncredited)

George M. Carleton

Guard

George Carlton

Bill - Museum Guard (uncredited)

Wheaton Chambers

Party Guest (uncredited)

James Conaty

Dandy at Party (uncredited)

John Crawford

Dandy at Party (uncredited)

Myron Healey

Dandy at Party (uncredited)

Scott Thomson

Motorcycle Rider (uncredited)

Harry Woolman

Cranwell - Traitor (uncredited)

Boyd Irwin

Danbury Servant (uncredited)

William H. O'Brien

Bates

Walter Baldwin