After the humans manage to free Godzilla and the other residents of Monsterland from mind control, the Kilaaks unleash King Ghidorah on the world. Anguirus, Rodan, Mothra, Kumonga, and many other ...

Godzilla sequel, Toho produced Mothra vs. Godzilla instead. It then followed up with King Ghidorah, the Three-Headed Monster, which teamed Godzilla with Rodan and Mothra against the titular villain.