Megalon, the monster god of the vengeful underground kingdom of Seatopia, is aided by Gigan in attacking the surface world, until android Jet Jaguar teams up with Godzilla to fight them.
The underground kingdom of Seatopia sends out Megalon, a giant beetle, and Gigan to destroy the above ground dwellers. In an attempt to stop them, an independently thinking robot brings Godzilla into the fight.—Todd A. Bobenrieth <TAB146@PSUVM.EDU>