Theo reveals himself and gets rid of Lydia, Malia and Stiles. He then sends an angry Liam after him to take the Alpha power away. Aiden dies although Melissa tried everything she could to save her. Stiles finds his heavily injured father. Theo seemingly kills Scott. Parrish takes Aiden away to be placed with the others. Melissa manages to bring Scott back to life. Theo out of options invades Lydia’s mind to get the location of the magic tree. Theo brings all the failed experiments back to life, thus becoming their Alpha. Melissa tells Scott he needs to give his pack hope in order for them to survive.