Theo Raeken

Theodore "Theo" Karl Raeken is a supporting character on Teen Wolf who made his first appearance in Season 5A. He was the first Chimera created by the Dread Doctors who managed to successfully complete his transformation without rejection, though he was not considered a true success. He went to school with Scott McCall and Stiles Stilinski up until the fourth grade, which was when his family left Beacon Hills, a year or two after the death of Theo's sister, Tara.

Theo returned to Beacon Hills for his senior year in the autumn of 2012 and wasted no time seeking out the McCall Pack in hopes of joining them. He posed as a recently-bitten Werewolf whose Alpha died before his first full moon, leaving him as an Omega; in reality, Theo was trying to get close to the members of the pack, as he planned turning them against their Alpha Scott McCall and eventually killing him in order to steal his powers and become Alpha himself, coveting the unique combination of supernatural creatures that made up the pack.

Unfortunately, Theo's plan, while perfectly executed for the majority of the half-season, was foiled when Mason Hewitt arrived and stopped Liam Dunbar from killing Scott at the last moment (since Theo, knowing only a Beta of a True Alpha's own making could steal their power, needed Liam to become an Alpha first in order to steal the power for himself). As a consolation prize, Theo used the Dread Doctors' green serum in order to resurrect four of the previously-killed "failed" Chimeras whose bodies were left at the Nemeton, creating his own Chimera Pack in which he was the self-appointed "Alpha" (despite the fact that he was neither a real Alpha nor a real Werewolf).

Throughout Season 5B, Theo continued his quest for more power with the help of his packmates, only this time, he focused his sights on stealing the powers and lycanthropy of the Beast of Gevaudan, who had recently been resurrected by the Dread Doctors. To do this, he pursued several different leads that he thought could help him achieve his goal, including obtaining Belasko's talons, capturing Deucalion (the only surviving expert in stealing powers from other creatures), and attempting to capture Lydia Martin, knowing that her Banshee connection with Jordan Parrish, the Hellhound prophesied to battle the Beast, would lure both Parrish and the Beast to him. He even killed two of his "Betas," Tracy Stewart and Josh Diaz, in order to steal their powers of Kanima venom production and electromagnetokinesis, respectively.

However, Theo's plans once again failed when the Beast proved immune to his venom. When he tried to retaliate against the McCall Pack for thwarting his plans (due in part to Deucalion, who was secretly working with Scott and had allowed himself to be captured) Hope Mikaelson, with the help with Josie and Lizzie Saltzman and the Skinwalkers, summoned Theo's deceased sister to drag Theo through a sinkhole and trap him underground. Theo's remained imprisoned beneath the underground tunnels of Beacon Hills until he was set free by Liam and Hayden in Season 6A's Ghosted.

After Theo's release, he maintained his usual survivalist personality, but slowly began to change as a result of the McCall Pack's influence, especially once Hope and the twins dispel the katana so he couldn't be sent back to his underground prison. By the end of the first half of the sixth season, Theo demonstrated genuine concern for people other than himself when he helped prevent Liam from being captured by the Ghost Riders and fought alongside Scott, Malia Tate, and Peter Hale (a former "bad guy" who was also on a redemption arc of his own) against Garrett Douglas and the Ghost Riders as well.

As of Season 6B's Raw Talent Theo is currently homeless, leaving him forced to live in his truck. When it became clear that the Anuk-ite was wreaking havoc on Beacon Hills, he became a reluctant ally of the McCall Pack, helping them defend themselves against the fear-inducing shapeshifter and the army of Hunters that formed partly due to this fear. Despite his initial feuding with the pack, he eventually proved himself as an ally who could be trusted to help them, leading Scott (who had plenty of reason to distrust him due to Theo killing him) to even refer to him as one of the town's protectors. Eventually he would begin the romantic relationship with Hope Mikaelson again and then years later get married.

Theo is a member of the Raeken Family and was the self-declared "Alpha" of the Chimera Pack before eventually becoming a trusted ally of the McCall Pack. He is alpha to the Crescent Wolf Pack. He has ties to the Mikaelson Family, Labonair Family, and Kenner Family through his marriage through Hope Mikaelson and their kids Jayden and Hayley Mikaelson.