The Cosmic Rape

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The Cosmic Rape is a science fiction novel by Theodore Sturgeon, originally published as an original paperback in August 1958. At the same time, a condensed or edited-down version of the novel was published in Galaxy magazine as a short novel, probably condensed by the editor, under the title To Marry Medusa. It was reprinted in 1977 by Pocket Books.
Its plot concerns an extraterrestrial hive mind named Medusa, which has assimilated many worlds and life forms and plans to absorb Earth as well. Dan Gurlick is an alcoholic who unknowingly ingests a spore from Medusa, which turns him into a host.