Casts
Richard Dix
as John Sinclair / John Carter
Lynn Merrick
as Joan Martin Sinclair
Rhys Williams
as Ernie Sparrow
James Cardwell
as Fred (Doc) Graham
Tom Kennedy
as Ferdinand / Hammerlock
Sam Ash
as Gibson Motor Car Co. Executive (uncredited)
Egon Brecher
as Dr. Rose (replaced by Frank Reicher) (uncredited)
Charles Coleman
as Sinclair's Butler (uncredited)
Byron Foulger
as Georgie (uncredited)
Martín Garralaga
as Tony, Fruit Peddler (uncredited)
