Max Duval
Dr. Bartholomew (voice)
Leland McKenzie
Russ DeKuyper
Dr. Copper
Mr. Westfall
Barbwire Salesman
Cromwell
Nicholas Cogliostro (voice)
Coy LaHood
Henry Sears
Dr. Lee
J. Edgar Hoover
Dr. Robert Allenby
Claude Estee
Dr. Nielsen
Dr. Welbeck
Lehman
Accountant (uncredited)
Louis B. Mayer
Abe
Leonard Driscoll
David Davis
Dr. Kipness