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This subject contains information from the "Lovecraft Circle" Myth Cycles, and while guided by HPL are not based on his work alone. This subject contains information from the Expanded Cthulhu Mythos, and not based on H.P. Lovecraft's works directly. The Yekubians are a fictional alien species created by H. P. Lovecraft, Robert E. Howard, Frank Belknap Long, Abraham Merritt, and C. L. Moore for their 1935 short story "The Challenge from Beyond". In 1994, Chaosium incorporated them into its Call of Cthulhu roleplaying game in the bestiary book Ye Booke of Monstres (although here they were referred to as 'Inhabitants of Yekub').


The Yekubians are a race of worm-creatures whom invade worlds and exchange their minds with those of the natives in a manner similar to the Great Race of Yith. They employ four-inch square crystalline cubes and any intelligent creature who looks into the cube has its mind drawn into a Yekubian machine. The vacated body is taken over by a Yekubian mind which uses it to explore. Once this it has completed its task, the alien uses the cube to send its own mind back.