Jackson Whittemore (Colton Haynes) was a lacrosse player at Beacon Hills High School on the MTV show Teen Wolf (2011-2017).
Jackson’s parents died in a car accident before he was born. His mother was kept on life support long enough for a c-section to be performed. Jackson was adopted by attorney David Whittemore and his wife.
He bullies Scott and Stiles, and is confused when Scott suddenly becomes a star of the lacrosse team and assumes he is on performance-enhancing drugs. Jackson discovers that Scott’s sudden prowess is because he is a werewolf, and looks for someone to turn him into a werewolf as well.
He eventually is bitten by Derek, but instead of becoming a werewolf is turned into a corrupted reptilian creature called a Kanima. While controlled by the Kanima master, he wreaks havoc on Beacon Hills.
It is only when Lydia reaches the humanity inside of the Kanima/Jackson that he is saved and can fully transform into a werewolf.
After he becomes a werewolf and learns how to control his powers, Jackson moves to London and doesn’t return until the final season. When he reappears at Bacon Hill, it is with his boyfriend of a year, Ethan.