Theo

Theo Raeken claimed to be a bitten werewolf but is, in fact, one of the Dread Doctors' experiments.

He claims to be a former 4th grade classmate of Scott McCall and Stiles Stilinski. He says he returned to Beacon Hills with his parents specifically to join Scott's pack but his plan was more to take away Scott's pack and his Alpha status.

Theo is played by actor Cody Christian.

Theo's Family
Officially, Theo's sister died of exposure after being lost in the woods 8 years ago but Theo was apparently with her and did nothing as he watched her suffer with a broken leg in a freezing creek.

Stiles found portions of Theo's story don't add up, specifically his father's signature on a school form seems to be forged.

Theo's "parents" seem terrified of him and he is seen preparing to crush his father's hand with a hammer to explain away Stiles "evidence" against him.

Season 5
Theo arrives just in time to help Scott fight off Belasko and explains why he returned to Beacon Hills. (Read More)

Theo helps Liam tell Mason about the supernatural. Theo can become an actual wolf through unexplained means. (Read More)

Theo is associated with the Dread Doctors in some, as yet unexplained, way. They allowed him to manipulate Donovan into attacking Stiles. (Read More)

Theo points Scott to the real author of the book and reports back to the Doctors that the pack is heading to Eichen House. (Read More)

Theo joins Scott and the gang as they settle in to read The Dread Doctors novel. He kills chimera Josh when he attacks Stiles. Theo then blackmails Stiles to keep quiet about the killing. (Read More)

Theo and Stiles watch over the vet clinic waiting to see who comes to take the chimera's body. Theo saves Stiles from a fire. (Read More)

Theo finds and recovers Hayden and Liam from the Dread Doctors. (Read More)

Theo lies to Scott and the Sheriff about Donovan's death. He pushes the Dread Doctors to keep Hayden alive. (Read More)

Theo reveals himself as a chimera and tries to take Scott down on the night of the supermoon. (Read More)