Jackson Whittemore

 Jackson Whittemore is Scott's lacrosse teammate and rival. He unspicably hates Scott. He is Lydia's boyfriend and a popular jock figure at school. He seems like a stereotypical spoiled bully, but he has a vulnerable side to him. He has recently vowed to find out exactly what Scott is hiding, making him an antagonist of sorts. In the mean time, he seemes to be doing anything he can to hinder Scott from stealing his thunder on the lacrosse field.

After being scratched by Derek, it seems that he is becomming a werewolf. This would also explain why the Alpha spared his life, but nothing will probably be final until future episodes. Some may also think that Jackson's biological father is the alpha and it does seem like it after Jackson was attacked in "The Tell".

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