This is the category for all species, sentient and non-sentient, within the Cthulhu Mythos that have an origin beyond Earth. This would exclude species, that while extremely "alien" like Shoggoths, are believed to have once been or are currently native to the planet Earth.
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- Seugathi
- Shan
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- Spawn of Hastur
- Spawn of Yog-Sothoth
- Star Vampire
- Strogg
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