Tracy

Tracy Stewart was a supporting character in Season 5 of Teen Wolf. She was the daughter of public defender Mr. Stewart and an unnamed woman. Tracy was also a senior at Beacon Hills High School. She was first introduced when she was having a counseling session with Natalie Martin in Parasomnia, where she admitted that she suffered from night terrors. After reading Gabriel Valack's book about the Dread Doctors, Tracy began to experience hallucinations of repressed memories she had of being transformed into a Chimera through their experiments. After snapping out of her hallucinations, the Dread Doctors killed Tracy by injecting her with an overdose of modified mercury, stating that her condition was terminal as a result of her body's rejection of the transformation.

Not long after her body was taken to the Nemeton by Jordan Parrish, Tracy was resurrected by Theo Raeken using a green serum created by the Dread Doctors. Afterward, Tracy immediately joined Theo's Chimera Pack, and proved herself to be the only member who never once questioned her place in the pack or felt conflicted about the things that Theo wanted them to do, as she seemed genuinely happy to be working with him and enjoyed using her powers against others.

Unfortunately for Tracy, her new-found confidence and powerful nature was short-lived, as she ultimately met her death a second and final time in the penultimate episode of Season 5, when Theo killed her to steal her Chimera powers in hopes that her Kanima venom would allow him to kill the Beast of Gevaudan and steal its powers as well.

When she was first introduced, Tracy originally appeared to be a nice and sweet girl who was very shy and quiet and who suffered in silence from night terrors that required her to see the guidance counselor and a psychiatrist. However, after her resurrection, she became a different person, both due to the darkness inside of her as a result of being brought back to life and the fact that Theo actively encouraged her to relish in this darkness. This was evidenced by the fact that, after joining Theo's pack, Tracy killed several people of her own free will. It was Deucalion who pointed out that Tracy must have felt defenseless and weak prior to becoming a Chimera, and he then suggested that it was this defenselessness that made Tracy enjoy the power she gained as a Werewolf-Kanima hybrid and use it to hurt others.