Sauron is a comic book character, a supervillain in Marvel Comics' main shared universe. An enemy of the X-Men, the character was created by writer Roy Thomas and artist Neal Adams. He first fully appeared as Sauron in X-Men #60 (September 1969). Sauron is the alter ego of Karl Lykos, sharing a Dr. Jekyll and Mr. Hyde relationship with the physician. He is an energy vampire who resembles a humanoid pteranodon after feeding. He often inhabits the hidden prehistoric jungle the Savage Land.