Director/a
Curt Siodmak
DIRECTOR/A
Herbert L. Strock
Reparto (por orden de créditos)
Richard Carlson
Dr. Jeffrey Stewart
King Donovan
Dr. Dan Forbes
Jean Byron
Connie Stewart
Harry ellerbe
Dr. Allard
Leo Britt
Dr. Benton
Leonard Mudie
Howard Denker
Byron Foulger
Mr. Simon
Michael Fox
Dr. Serny
John Zaremba
Chief Watson
Lee Phelps
City Engineer
Watson Downs
Mayor
Roy Engel
Gen. Behan
Frank Gerstle
Col. Willis
John Vosper
Capt. Dyer
John Dodsworth
Dr. Carthwright
Charles Williams
Cabbie
Michael Granger
Kenneth Smith
William 'Billy' Benedict
Albert
Kathleen Freeman
Nelly
Douglas Evans
Pilot
Strother Martin
Co-Pilot
Jarma Lewis
Stewardess
Elizabeth Root
Joy
Juney Ellis
Spinster
Robert Carson
Airline Pilot(uncredited)
Donald Kerr
Nova Scotia Lab Worker(uncredited)