Toho’s A-list was all working on King Kong Escapes while Godzilla got what was left behind, just like what happened with Ebirah, Horror of the Deep. It’s the first movie where Godzilla’s son Minilla appears, a character created not for kids but for young Japanese women on dates who adore kawaii — or cute — versions of characters.
Minilla is discovered within his egg buried deep in the Earth, his crying disrupting a weather control system — well, that seems like a bad idea — that scientists are setting up on Monster Island, of all places. Some giant bugs called Kamacuras (Gimantis in America) try to eat the egg and Godzilla shows up to save the child and decimate those annoying insects.
Minilla grows to half our hero’s size and while he can only blow smoke rings, he’s still willing to fight a giant spider named Kumonga to save some humans, who respond to this kindness by freezing the island so that they can escape. Godzilla says, “Screw this,” and goes to sleep.
When this was released in Italy, it was titled Il Ritorno di Gorgo (The Return of Gorgo), which is an absolute slap to to the green face of Godzilla, seeing as how Gorgo is an absolute ripoff of the original film.