Wilbur Whateley is the main antagonist of the short story The Dunwich Horror by the late H.P. Lovecraft. He is a half-human, half Outer God hybrid motivated to release the Great Old Ones back onto the Earth to rule over it.
Wilbur and his twin brother were born at 5 a.m. on February 2, 1913, to Lavinia Whateley. For reasons unknown, Old Whateley sacrificed his daughter to the Outer God Yog-Sothoth and she was impregnated painfully. Wilbur was considered goat-like in his appearance and was reviled by the dogs scattered throughout Dunwich, Massachusetts. He grew at an unnatural pace being able to speak at an age most children could not. He was then strictly indoctrinated by his grandfather who desired for him to release the Great Old Ones so they could rule once more. After Old Whateley's death, Wilbur sets out to fulfill his dark purpose. His mother also disappeared mysteriously, a common suggestion is that Wilbur sacrificed her.
Unfortunately, the copy of the Necronomicon that the family had was ruined and he was unable to use page 751 to open the gates to Yog-Sothoth. After traveling to multiple libraries, he visits Miskatonic University to inquire of Dr. Henry Armitage his copy of the Necronomicon. Armitage refuses to distribute the copy compelling Wilbur to break into the library at night to steal the book. Before he could achieve this, he is mauled to death by the guard dogs.
When Henry Armitage and his search party find Wilbur's body, it is revealed that he had yellow and black markings on his back; bloody tentacles laced with teeth and seeming rudimentary eyes on both hips. He also had a bizarre greenish-yellow substance in the place of blood.
The titular Dunwich Horror escapes its confines and goes on a violent spree having destroyed two families. With the use of a magic powder and the utterance of some magical spells used all together, it renders the Dunwich Horror visible and it is destroyed after calling out the name of its father. Its essence is then returned to Yog-Sothoth's realm.