 In this homage to the cliffhanger serials of the  30s and  40s, 19th Century Wild West Marshal Jim Donner stumbled upon a secret underground city known as Chimera while chasing a gang of robbers. Chimera is lorded over by an evil despot named Thorval. Donner teams up with the resistance rebels in their effort to overthrow Thorval s cruel reign, while simultaneously investigating the gold robberies on the surface.