Claire Forrest seeks her kidnapped scientist father, hidden somewhere on Mystery Island. He is held and forced to work on diabolical inventions by Captain Mephisto, a costumed villain.

The latest assignment for respected detective Charlie Chan has come directly from the government and involves the disappearance of a scientist named Harper, who was working on an extremely important…

Texas Rangers Tex Wyatt, Jim Steele and Panhandle Perkins are sent to the district of Rawhide to investigate the killings of several ranchers. Tex enters the town posing as a…