Giant bug aliens from a dying planet in “Space Hunter Nebula-M” plot assume the bodies of dead humans and work as the development staff of the peace-themed theme park, World Children’s Land, the centerpiece of which is “Godzilla Tower”. Then they plan to use Gigan and King Ghirorah to wipe out all earthlings.
An experimental satellite-based weapon that fires miniature black holes, called the Dimension Tide, opens a wormhole through which a giant prehistoric dragonfly enters the present and deposits a single egg before exiting through the wormhole. A boy finds the egg and takes it with him when he moves to Tokyo. The egg starts oozing a strange liquid, so the boy throws the egg in the sewer. The egg, actually a mass of hundreds of eggs, splits up and starts growing when exposed to water, hatching into giant dragonfly larva called Meganulon that come out of the sewer to feed. They flood a portion of the city and moult on the sides of buildings, becoming adult Meganula.
During an archaeological expedition to Siam, the power of the Golden Scorpion allows young radio broadcaster Billy Batson to meet the ancient wizard Shazam who gives him magic underpants so that he can protect those who may be in danger from the Scorpion’s curse.
After the apocalypse, a group of mental health patients have inherited the Earth. Armed with a short bus and imagination, they must rebuild society and find the edge of the world.