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Landscape of the Phantom Planet.

The Phantom Planet (ファントム・ガイア, Fantomu Gaia?) is an unnamed planet from which the Phantoms originate in Final Fantasy: The Spirits Within.

Similar in nature to Earth, the planet had its own spirit and supported a variety of life forms. One of its prominent species became embroiled in a cataclysmic war that destroyed the planet's environment and ultimately the planet itself.

A fragment of the planet was flung across space, becoming a meteor that crashlands on Earth and starts the Phantom invasion that devastates the living population.