When San Francisco is hit by thunderous tremors, many buildings fall beneath the Earth's crust. It also so happens that Dr. Quinn, of the Calico crew needs to go to a meeting in San Francisco. They quickly discover huge holes where buildings have fallen in, and soon find the Earth Eater in one of them. Blinding it with their head lights, they manage to escape the creature, but the Earth Eater is on their tail.
As they escaped the Earth Eater, Godzooky managed to call on Godzilla, who quickly arrived to do battle. As Earth Eater chased the Calico crew, Godzilla arrived and challenged the Earth Eater. The Earth Eater used all the weapons at its disposal, but after Godzilla used his lasers, Earth Eater used its sonic blasts to stun Godzilla and retreated beneath the ground.
Earth Eater fed on dirt while the Calico crew made a plan to knock him out with gas bombs. In doing so, Earth Eater tunneled through the ground and burst from the tarred roads. Godzooky called on Godzilla again. As the crew escaped on a cable car, the tremors sent their vehicle out of control. Before any harm could befall them, Godzilla grabbed the car, and placed it safely out of the way.
Godzilla stomped forward, emitting deadly atomic flames from his maw. The Earth Eater retaliated with sonic blasts, but Godzilla moved, causing them to strike a building. Godzilla grabbed Earth Eater in a bear hug, and the two started to wrestle until Earth Eater got loose. Earth Eater again managed to defeat Godzilla with the sonic blasts and escape for the second time.
Godzilla was on the move, looking for the deadly Earth Eater. As Godzilla and the Calico crew searched, they soon found him on top of the Golden Gate Bridge. The Earth Eater bellowed in anger at the Monster King, who quickly unleashed his laser eyes. Godzooky flew up, causing Earth Eater to bellow in anger, and tried to slam his tail into Godzilla's nephew, but the Earth Eater missed, causing him to hit the bridge below him, shattering the suspension part he was on top of and sending him splashing into the water. Earth Eater cried in pain as the water turned him into mud, ending the Earth Eater for good.