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This article is about a character appearing in the animated series, which is not canon. You may be looking for the live-action series counterpart, if any.
Anderson was a character from Supernatural: The Animation.
Anderson was a hunter who heard of John Winchester from other hunters. He also found out about Susan Lyle's deal with the demon Azazel, that she had sold her soul in exchange for the revival of her son and husband, who had died in an accident.
However, he felt most disturbed when he heard the demon once say that John's son, Sam Winchester, would one day lead an army against this world, causing countless deaths in the future.
Anderson sought to stop this from happening, especially after signs began to appear that Sam was no ordinary human.
Anderson attacked the family in their home, where Susan also was, but was forced to flee soon after, with John giving chase. Anderson eventually revealed himself and told John everything he knew. John however, did not believe him and threatened to kill Anderson, forcing Anderson to draw a gun on him.
Despite being horror-struck by all the things Anderson said, John managed to kill Anderson. His words continued to haunt John, maybe even years after his death. The fact that Sam showed abnormal abilities prior to their encounter unnerved John greatly.