John Sinclair / John Carter
Joan Martin Sinclair
Ernie Sparrow
Fred (Doc) Graham
Ferdinand / Hammerlock
Gibson Motor Car Co. Executive (uncredited)
Dr. Rose (replaced by Frank Reicher) (uncredited)
Sinclair's Butler (uncredited)
The Whistler (uncredited)
Georgie (uncredited)
Tony, Fruit Peddler (uncredited)
Doctor (uncredited)
