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.
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And I had thought 'Godzilla's Revenge' was the worst. Just terrible 13th entry in the series doesn't even have Godzilla join the battle until the hour mark in the cheapest looking suit creation yet. Mix of sea kingdoms, Ultraman rip-offs and joke monsters isn't even good for the tikes. Mind you the closing theme is a hoot. There may well be more stock footage here than new.