Prof. Nathaniel Billings
Boris Karloff
Dr. Arthur Lorentz
Peter Lorre
Officer Fred
Frank Mitchell
Trooper Quincy
James C. Morton
Officer Joe Starrett
Frank Sully
Munitions Plant Road Guard
Patrick McVey
Alarm Clock Salesman
Robert Emmett Keane
Maxie
Maxie Rosenbloom
Winnie Slade
Jeff Donnell
Bill Layden
Larry Parks
Amelia Jones
Maude Eburne
J. Gilbert Brampton
Don Beddoe
Ebenezer
George McKay
Mr. Johnson
Eddie Laughton
Silvio Baciagalupi
Frank Puglia
Music Director
Morris Stoloff
Director
Lew Landers
Story
Hal Fimberg
Robert B. Hunt
Screenplay
Edwin Blum
Adaptation
Paul Gangelin
Director of Photography
Henry Freulich
Editor
Richard Fantl
Producer
Colbert Clark