Tyler Posey plays Scott McCall, a teen who was first bitten by an Alpha in 1.01, And his whole life changed ever since he got bitten by an Alpha and in Season 2 he was trying keep control of his werewolf abilities and to protect the ones he loves and cares about and then in Season 3 he gets a brand new tattoo on his arm and then Derek tries to make it permanent and now the Alpha Pack arrives and he helps Derek find his two teen betas (Erica and Boyd). and then he finds Boyd and then his sister Cora appeared and then her and Boyd were wild and bloodthirsty and then him, Derek and Isaac were planning to trap them in the school's boiler room and then his boss was trapped in the bank vault and that was the place when Erica, Boyd, and Cora were trapped and then he tries to break the forcefield and while he does that his eyes turn from Yellow to Red and that why Scott is the True Alpha werewolf.