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The Cthulhu Gallery is the collected images of Cthulhu. Originally appearing in the short story "The Call of Cthulhu" by H. P. Lovecraft, the character of Cthulhu has been expanded upon by numerous others in the decades following.
Eldritch or demonic tentacled beings that somewhat look like Cthulhu and/or they have similar lore (imprisoned in a dimension and/or an island civilization that sunk, and who a cult or monstrous followers are trying to release).