Jack Packard

Jim Bannon

Janet Mitchell

Anita Louise

Nurse

Mary Newton

E. R. Willard

Edward Earle

Senor Mendoza

Fred Godoy

John, butler

John Elliott

Quentin Mitchell

Frank Mayo

Introductory Narrator (voice)

Frank Martin

Frank, Willard's aide

Coulter Irwin

Closing-Time Museum Guard

Bud Averill

Brophy, museum watchman

Harry Strang

Rex Kennedy

Michael Duane

Doc Long

Barton Yarborough

Leon Hartman

Paul E. Burns

Det. Capt. Quinn

Thomas E. Jackson

Louise Mitchell

Mona Barrie

Prof. Arthur Logan

Frank Wilcox

Curator Raymond Halliday

Richard Hale

Dr. Karger

Ludwig Donath

Director

Henry Levin

Director of Photography

Henry Freulich

Screenplay

Charles O'Neal

Additional Dialogue

Dwight V. Babcock

Radio Play

Carlton E. Morse

Assistant Director

Carl Hiecke

Music Director

Mischa Bakaleinikoff

Set Decoration

George Montgomery

Editor

Jerome Thoms

Art Direction

Robert Peterson