The storyline of Save the Earth takes place two years after Godzilla: Destroy All Monsters Melee. The story involves mankind getting hold of Godzilla's DNA, known in the game as "G-Cells." The Vortaak learn of this, once again returning to Earth, controlling a vast army of monsters, including their ultimate weapon: SpaceGodzilla. The player faces down many controlled monsters in different locations. In the climax cut-scene, Godzilla confronts SpaceGodzilla in a final duel. Godzilla blasts off SpaceGodzilla's shoulder crystals causing a black hole to form. SpaceGodzilla is sucked in and apparently killed, forcing the Vortaak to retreat while Godzilla lets out a roar of victory having saved Earth yet again. This time around, new monsters are added as well as more detailed arenas including hills, elevated highways, and waist-deep water. Another addition is Challenge Mode, in which the player must attain goals other than simply defeating their opponent. Also for Xbox there was an online play. This mode is now offline.