Alpha pack

The Alpha Pack were one of the main antagonists of the first half of Season 3. This pack was like no other seen before, as it consisted solely of Alpha Werewolves. These Alphas were each individually unique as well, as every member killed all of the Betas in their previous pack in order to steal their power, making them Augmented Alphas with even stronger supernatural abilities.

However, it is unknown if the Alpha Pack functions like a normal pack in which the minimum of three Betas amplifies their own power as well as that of their Alpha; the pack did have a leader in Deucalion, who was in charge of the three subordinate Alphas Ennis, Kali, Ethan and Aiden, but their status as Alphas may have prevented them from working as an ordinary pack.

The Alpha Pack came to Beacon Hills in the early summer of 2011, where they immediately captured Hale Pack runaways Vernon Boyd and Erica Reyes, as well as the long-lost Cora Hale, who had returned to her hometown after hearing about a new Hale Alpha building a pack. However, the Alpha Pack didn't officially reveal themselves until August. It was originally believed that the Alpha Pack's sole mission was to recruit new Alpha Derek Hale to their pack, but, in time, it was eventually revealed that, while they were interested in Derek joining their ranks, they wanted him to join so that Scott McCall, a potential True Alpha, would be more likely to join as well; Deucalion wanted the perfect pack, which he believed he could achieve through the addition of a very rare True Alpha.

Unfortunately for Scott, Deucalion decided that if he could not convince or manipulate him to join the Alpha Pack, he would force Scott to kill so that his potential to become a True Alpha would be destroyed. To achieve the former option, Deucalion had each Alpha perform a specific task. Ethan and Aiden were made to get close to Danny Mahealani and Lydia Martin, respectively, as Deucalion knew that one of them would be important to Scott; this person was later revealed to be Lydia, who was soon identified as a Banshee by Jennifer Blake. Meanwhile, Kali was tasked with manipulating Derek to join the pack by threatening to kill him if he didn't kill all of his Betas; when Kali became annoyed with their attempts to add Derek, who she saw as a desperate Alpha to a bunch of pathetic teenagers, to their ranks, Deucalion killed Ennis and blamed his death on Derek in order to further motivate her in her mission.

The Alpha Pack's efforts to recruit Derek and Scott were somewhat side-tracked by the arrival of a Dark Druid, Jennifer Blake, who intended to get her revenge on the Alphas after Kali attempted to kill her, as her Emissary, as part of her initiation into the Alpha Pack. Jennifer was ultimately successful in this task, as she killed Kali by using her telekinesis to impale her with hundreds of shards of broken glass, injuring her beyond her capacity to heal, and snapped the neck of the merged Ethan and Aiden, thereby killing the Alpha spark in them and demoting them to Omegas once again. With Deucalion the only survivor who retained his Alpha powers, the Alpha Pack was thereby disbanded and likely to ever be restarted due to Deucalion's change of heart as a result of Derek tricking Jennifer into using her powers to heal Deucalion's damaged eyes and restore his eyesight.