Lewis Erskine
Arthur Ward
Narrator (uncredited)
Special Agent Tom Colby
Barbara Erskine
Agente especial Chris Daniels
Agente especial Jim Rhodes
Willard Smith
Mrs. Ferguson
Charlie Hunter
Harry Considine
Mr. Ferguson
Gregory Lucas
Trainee
Librarian
Maury Ashwood
Dominic
Technician (uncredited)
Director
Writer
Technical Advisor
