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Stewart Swinton is the main antagonist of the 1994 thriller film Wolf.  

He was portrayed by James Spader who also plays Ultron in Avengers: Age of Ultron.


Stewart Swinton works with Will Randal at a publishing house. He seems like a charming individual who seems to idolize Will. However he shows his true colors when he begs their new boss to give Will's position to him. He had also been having an affair with Will's wife, Charlotte, behind his back. Will, who had been bitten by a werewolf earlier in the film, discovers this when he smells Stewart's clothes in his home. He arrives at Stewart's house and goes up the stairs to find Charlotte half-naked in his bedroom, but not before biting Stewart in the hand when he tried to stop him, thus turning him into a werewolf as well.

Will gets his revenge on Stewart by firing him and even urinates on his shoes when they confront each other in the restroom. Stewart begins to succumb to his inner beast during the full moon and kills Charlotte. Will is then deemed a suspect by both himself and the police.

When Laura Alden, the daughter of Will's boss, goes over to the police station, Stewart shows up and meets her. She becomes suspicious of Stewart given his change in eye color as well as him exhibiting other werewolf traits. Stewart invites her to have a drink with him, and she agrees. However, right when he goes to talk to the detective, she leaves immediately. Stewart is talking with the detective with the intent of framing Will for Charlotte's murder. When he discovers Laura left, he drives over to her house, kills two of her security guards, and begins to transform more into a wolf. He attacks Laura and tries to rape her, however Will intervenes and the two werewolves engage in a fight. Will overpowers Stewart, however once he has his back turned, Stewart tries to kill him but is shot to death by Laura.