Simon A.K.A. The Chemist is a antagonist appearing in season 4 of MTV's Teen Wolf. He was an assassin hired by the Benefactor to kill all of the supernatural creatures in Beacon Hills
He first appears as he poisons and kills a pack of werewolves led by a werewolf named Satomi. He did so by using a variant of the canine distemper viruses to infect them. He later poses as a proctor at Beacon Hills high school for a PSAT and infects the students with an ink pad. He is later confronted by Stiles. Just as he is going to kill Stiles, he is then shot and killed by Agent McCall.