Ansem Weems was the antagonist in a Supernatural episode "Simon Said". Ansem was one of Azazel's Special Children, and he had the power of mind control and telepathy. Ansem was evil and abused his powers, making people kill each other. Ansem made a man gun down a gun store owner, he made a woman douse herself in oil and then incinerate herself, and he was about to make Tracy jump off the dam and kill herself when Sam stopped him. Ansem had killed the mother of Andy, one of the other Special Children. Andy fought Ansem and he killed him.
Unlike some of the other Special Children, Ansem had not lost his mother to Azazel as his father kept his promise and didn't interrupt the Demon during his ritualistic meeting.