When heads of state gather at the G8 summit in Japan, Guilala -- the intergalactic monster that had been banished from the earth in The X from Outer Space -- returns to ravage the Japanese countryside and threaten the world leaders. Military strikes prove futile against the beast, but a reporter learns that one rural community possesses a strange ritual that might influence the creature. Minoru Kawasaki directs this campy satire.

Dan is a former geisha, now working as an ace pilot for the Earth Defense Troops. Her fiance was killed by the space monster Bemurasu which consumes nuclear waste. To save Planet Earth, Dan attacks Bemurasu, but whenever she does, she feels ecstasy. Can she save Planet Earth?

Yuta, a young master at the Tsukiji Fish Market, accidentally drops his meal of mixed seafood into the Sumida River. Some time afterwards a gigantic mutated squid monster arises from the depths and begins to wreak havoc upon an awe-stricken Tokyo. Attempts by the Japan Self-Defense Forces to stop the creature prove futile. As it seems things couldn’t get any worse an enormous mutant octopus monster emerges from the deep and heads into a clash of the titans with the gargantuan squid! As a last ditch effort, the government forms the “Seafood Monster Attack Team (SMAT)” and an all-new plan of attack is immediately put into action. But just as the tide appears to be turning in humanity’s favor, a colossal crab monster appears, joining in the Monster Seafood Wars and plunging the world into culinary chaos…