The three-headed space monster is dispatched to protect the alien stronghold at Mt. Fuji, and battles Godzilla, Minilla, Mothra, Rodan, Gorosaurus, Anguirus, and Kumonga (Manda, Baragon and an unnamed Varan are also present but do not take part in the battle).
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Godzilla attacks New York City, Rodan invades Moscow, Mothra lays waste to Beijing, Gorosaurus (wrongly identified as Baragon) destroys Paris, and Manda attacks London, which is set in to motion to take attention away from Japan, so the aliens can establish an underground stronghold near Mt. Fuji in Japan.