Even though he and his people were by no means inherently violent, when atomic tests conducted by the surface-dwellers threatened the stability and very existence of his country, Antonio appealed to the Seatopians' god, Megalon, to go forth and destroy the surface-dwellers. He also sent two of his agents to the surface to steal Jet Jaguar, to act as a guide for Megalon, and when Godzilla's intervention threatened the Seatopian plan, Antonio called upon the M Space Hunter Nebula Aliens to ask for Gigan's assistance as well. In the end, after Megalon's defeat, Antonio recalled the monster and sealed off the entrance to the surface world.
- Although Antonio's actor Robert Dunham could speak both English and Japanese fluently and had delivered his own lines in prior film appearances such as Dogora, he was dubbed over by Goro Naya in the Japanese version and Ted Thomas in the English version of Godzilla vs. Megalon.
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