| Requires Expansion|
|“|| Theo: "You don't have to hide from me, Corey."|
Corey: "I was trying to do something nice."
Theo: 'You were trying to do something normal, but you don't have to be normal anymore. And you definitely don't have to be nice.
Corey and Theo first met in Season 5A's Ouroboros, when Theo witnessed Scott McCall using his claws to perform the memory manipulation ritual on him to find out what he knew about the Dread Doctors. Theo went on to help Scott attempt to save Corey, who was revealed to be a failed Chimera when he began rejecting his transformation, from being killed by the Doctors, but they were too late. In the Season 5A finale, Theo resurrected Corey with the Dread Doctors' green serum and recruited Corey to his new Chimera Pack.
Despite the gratitude Corey felt toward Theo for bringing him back to life, he still feared Theo and was hesitant to fully embrace the dark and violent behavior that Theo endorsed for his pack. However, he eventually became more confident in the use of his Chimera abilities and used them to break into Eichen House with Theo, Tracy Stewart, and Josh Diaz to try to capture Lydia Martin in hopes of using her connection to the Hellhound, Jordan Parrish, and by extension, the Beast of Gevaudan.
When Theo encouraged Corey to take down Parrish, Corey balked and stated that he was "on fire", though he ultimately did what he was ordered, sustaining full-body third-degree burns in the process. It was this event that caused Corey to start to see through Theo's behavior and he realized that he and the other "Betas" were just pawns to Theo, causing him to switch his allegiance to Scott and the McCall Pack instead due to his boyfriend Mason Hewitt's influence. The two were then separated when Theo was imprisoned underground by Kira Yukimura and the Skinwalkers, and though they have had minimal interaction since he was freed several months later, Corey and Theo are now technically allies due to Corey being a member of the McCall Pack and Theo being a reformed and dedicated friend to the pack.
Throughout Teen Wolf
In Ouroboros, after Mason Hewitt realized that Corey Bryant was one of the Chimeras created by the Dread Doctors, he brought him to the McCall House, where Theo Raeken, Stiles Stilinski, Malia Tate, Lydia Martin and Scott McCall were trying to figure out how to save Hayden Romero and Liam Dunbar from the Dread Doctors. Theo watched with interest as Scott, desperate to save his Beta Liam and his girlfriend Hayden, wasted no time in performing the memory manipulation ritual by inserting his claws in the back of Corey's neck. After Corey's memories indicated that the Dread Doctors were using an operating theater in the underground tunnels adjacent to the water treatment plant, Scott, Malia, and Mason decided to go look for them, while Theo (who, as the Dread Doctors' secret ally, knew where Hayden and Liam were all along) offered to stay behind with Corey and Lydia.
Theo assisted Lydia in convincing Corey not to leave out of a fear of the Dread Doctors by arguing that Lydia's powers as a Banshee meant that she can sense if someone like Corey is going to die. When Lydia questioned Corey on if he could remember anything else about his captivity with the Doctors, Lydia and Theo realized that the Doctors may also be using the abandoned house where Jordan Parrish found Belasko in Creatures of the Night.
In Status Asthmaticus, Theo stole the Dread Doctors' green serum (made from the healing factor of Alpha Löwenmensch and former Nazi soldier Garrett Douglas, also known as Der Soldat) to resurrect Corey, Hayden, Tracy Stewart, and Josh Diaz. As Corey awakened on the roots of the Nemeton, Theo informed the Chimeras that they were his new pack and that Theo was their Alpha. Corey, along with the other Chimeras, then went on to follow Theo out of the woods.
- After learning about the type of person and Theo was, Corey swiftly left Theo's pack and joined the McCall Pack.
- Theo often used threats and fear to control Corey into doing what he said, as he did with the most of his pack.
- Unlike Tracy and Josh, Corey was not killed by his "Alpha" in an attempt to take his power.
- Corey and Theo are the only known Chimeras who retained their powers and are still alive.