The Great Secret

The Great Secret
Overview
A wealthy young athlete comes to the aid of a beautiful heiress, whose fortune is being threatened by two arch villains, The Great Master and Doctor Zulph.
Similar
The Phantom Rider (1946)
Doctor Who: The Reign of Terror (1964)
The Hazards of Helen (1917)
The Lost Jungle (1934)
The King of the Kongo (1929)
The Wolf Dog (1933)
Perils of the Royal Mounted (1942)
From the Valley of the Missing (1915)
Bruce Gentry (1949)
Sea Raiders (1941)
In the Days of Daniel Boone (1923)
Drums of Fu Manchu (1940)
Flash Gordon (1936)
Cody of the Pony Express (1950)
Zorro's Fighting Legion (1939)
The Hurricane Express (1932)
The Adventures of Smilin' Jack (1943)
The Big Fight (1930)
G-men vs. the Black Dragon (1943)
The House of Hate (1918)