La Bête du Gèvaudan

Sebastian Valet or known as La Bête du Gévaudan is the final antagonist of the TV series called Teen Wolf, he is related to the Argent and a serial killer in the eighteenth century.

He is portrayed by Gilles Marini.

Background
Sebastian was a French soldier and a serial killer who attracted and killed children. The court in question erased all records of his crimes, and thus erased any evidence that would link him to the crimes. He for some reason became a werewolf with dark powers, this allowed him to turn into dark looking werewolf, after Sebastian started killing 113 people, however said by the Dread Doctors he killed at least 500 people, and during the Sebastian's many attacks say that the Beast killed for sport because it simply never ate its victims like a wold did. And after his sister Marie-Jeanne Valet found out what he really was, she got him burned and killed him.

Season 1
La Bête du Gevaudan is mentioned by both Kat and Allison Argent, when Allison learns that her ancestor killed by La Bête du Gevaudan in France in the 1760s, what was not known is that the Beast was also her ancestor.

Season 2
When Sebastian is later ressurected by the Dream Doctors, he later suceeded in owning Mason as he was a genetically disturbed chimera and had twin syndrome. And during that time he continued to hunt the townspeople. And while Liam and Haydem are pursued by him, Scott and Styles investigate the attacks by the Beast in the past. The Beast threatens to kill Theo and Tracy and Dream Doctors says to stay out of their way and not intervene in their plans. The Sheriff of Beacon Hills then leads a chase against Sebastian who leads him to the hospital, while Scott discovers human-to-human footprints that lead to the creature, but the Beast sets a trap to lure Scott's pack to him, but his plans are simply frustrated by Parrish, he later shows up at school making and then the pack rushes into the school, and he comes back and simply terrifies the school with his presence, however Scott notices the scent and the creature returns Mason and killed both Dream Doctors. And suddently when he returns to Beast, and turns out to be Sebastian Valet in Mason's spot, he fights Scott, he finds Allison's memory and is impressed with it looks like Marie-Jeanne Valet, but when he is distracted, he is attacked by Scott who gives Lydia enough time to get Sebastian out of Mason's body, but he tries to escape only to be stopped by Parrish and defeated by Scott who kills him with a spear.

Personality
Sebastian while posing as a good person that all this was just a facade, he was a sociopath, cruel, sadistic and dangerous who killed people for sport said that by some, he had also disregarded human life and authorities seen that when he threatened Noah, he also shows no empathy even to those who helped him seen when he killed the two Dream Doctors despite leaving Marcel to die.

Trivia

 * Sebastian's story was based on the Beast of Gevaudan affair which was a real case Beast of Gevaudan which was a case of opinions that many believed if only a wolf, and many also believed if a werewolf because of the way the creature victims kill.