John Shirley (as Ben Wilson)
Polly Marion
'Red' Warren
Dr. Reynolds (as Joseph Girard)
Professor Duval
Captain Cronin
William Grimsby
Emil LaRoux
Mrs. Reynolds
Professor Montague
Alvin Van Cleft
Howard Van Cleft
(as Edward Gibson)
Pale Ida
Short (as Lou Short)
Wayne
Dorian
James Walsh