As Japan joins in a political pact with Nazi Germany and fascist Italy, Admiral Isoroku Yamamoto is appointed supreme commander of the Japanese fleet. With Japan headed inexorably toward war, Yamamoto, despite his misgivings, believes the only possible victory lies in destroying the American fleet by surprise at Pearl Harbor. The attack succeeds, but fails to sink the American carrier fleet. Thus Yamamoto must lead the Japanese navy into war with ever-diminishing likelihood of success.
Astronauts Glenn and Fuji investigate Planet X and encounter mysterious aliens known as the Xiliens, who ask Earth's people to help save their world from "Monster Zero". In exchange for borrowing Godzilla and Rodan, the Xiliens offer a cure for cancer. As Glenn investigates, he develops a romance with Miss Namikawa and uncovers the Xilien's true intentions.
After being mistaken for an Interpol agent, a man who was just supposed to go on vacation gets mixed up in a war between two gangs intent on winning the favor of a notorious arms dealer.
After a meteorite unleashes a three-headed beast upon Tokyo, Mothra tries to unite with Godzilla and Rodan to battle the extraterrestrial threat.
Five vacationers and two crewmen become stranded on a tropical island near the equator. The island has little edible food for them to use as they try to live in a fungus covered hulk while repairing Kessei's yacht. Eventually they struggle over the food rations which were left behind by the former crew. Soon they discover something unfriendly there...
A Japanese family is torn apart by the tensions of an avoidable nuclear world war between the superpowers.
When a rare species of butterfly is found in a mysterious valley in Japan, a pair of entomologists go to investigate and find more. They discover Varan, a giant monster, who decides to leave the valley and head straight for Tokyo.
Nuclear tests create a radioactive man who can turn people into slime.
A squadron of Japanese fighter pilots realise that they are never going to win the war when they understand that Japanese military tactics have little regard for life. Seeking the companionship of any woman who will have them, they spend their days indulging in every fantasy in order to escape the overwhelming fear of death looming just over the horizon.