The theoretical "final enemy" of Sailor Moon Sailor Stars, the last season of Bishoujo Senshi Sailor Moon. Later it is revealed that Galaxia is merely the shell of Chaos, the true "big boss" of the season.

In the final volume of Isaac Asimov's "Foundation" novels, the hero lands on the mystery planet, and is made to decide whether humankind will continue as a collection of individuals, or evolve into a psychic collective. This collective would be like unto a single, galaxy-spanning organism, "Galaxia". Written before the Star Trek development of the Borg, Galaxia is like Gaea in the Gaea Hypothesis, but sapient.

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