A frozen Tyrannosaurus rex is found and put on display in a museum, but when he thaws out and revives, Superman has to stop his rampage.

Gaira, a humanoid sea beast spawned from the discarded cells of Frankenstein’s monster, attacks the shores of Tokyo. While the Japanese military prepares to take action, Gaira’s Gargantua brother, Sanda, descends from the mountains to defend his kin. A battle between good and evil ensues, leaving brothers divided and a city in ruins.

20 years ago, 3 men robbed a stage and hid $30,000. They were caught and sent to prison by Marshal Steve Autry. 20 years later, the men bust out of prison and return to the ghost town where they stashed their treasure searching. Steve’s grandson picks up where Steve left off to foil the plans of the outlaws.