On Skull Island lived herds of plant eaters called Ferrucutus. The Ferrucutus where large creatures up to 34 feet and there only predators where V-rexes. When Skull Island sank in 1945 the Ferrucutus where moved to Monster Island they adjusted to living in the plains and have made friends with Anguirus.

Spacegodzilla has returned to destroy Monster Island, Earth and the Universe. Godzilla and the others tried to stop Spacegodzilla, but they are not strong enough. They need to find two more monsters so that they can defeat Spacegodzilla and save the world.