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.