The Mi-go are an ancient interstellar civilisation. Theyare large, pinkish, fungoid, crustacean-like entities the size of a man. They are made of a form of matter that does not occur naturally on Earth. About 5 feet long, their crustaceous bodies bear numerous sets of paired appendages. Their head looks like a complex set of antennae like appendages changing colors constantly, which is used for communication. They also possess a pair of membranous bat-like wings which are somehow used to travel through space.
Their religious beliefs seem to have relatively minor importance compared to their scientific interests. Their moral system is completely alien, making them seem highly malicious.
Mi-Go have visited Earth for more thant 150 millions years, mainly for mining reasons, and have a base of operation in the outer solar system on the word called Yuggoth, which is beleived to be Pluto.