Robert Wilcox
(Larry Mitchell)
Helen Mack
(Mollie Riley)
Edward Brophy
(Cuthbert Innocent)
Irving Pichel
(Professor)
Joe Sawyer
(Tony Garzoni)
Selmer Jackson
(Steve Riley)
Sam McDaniel
(Speedy)
Dorothy Vaughan
Al Hill
John Harmon
Rudolph Chavers
Tim Davis
Dorothy Arnold
Eddie Hall
Robert Homans
Cyril Ring
Charles Sullivan