Gaia is the mother of Earth and the Titans. She sleeps deep beneath the Earth and dislikes anyone who disturbs her. She first appeared in the Hercules animated series episode Hercules and the Prince of Thrace.
In the Spongebob series, Gaia is revealed to be one of the primodial gods that created the Universe, and was given the Olympius Worlds to rule as her domain. The only reason she turned evil in the myths was because the corruption of the Void contolled her, making her summon Typhon and Echidna to destroy the Gods against her free will.