Zachary Cain

He is part of the 'mutt' uprising against the pack. He helps in killing Pete and assists in recruiting psychopaths to be bitten, then fight against the pack. He is eventually captured by Elena and Clay in an attempt to get information from him. When it is found that Jeremy was cut with a poison knife, Elena tracks down his girlfriend, Amber, and offers his life for her turning in the other mutts. It is revealed in season two, episode nine "Scavenger's Daughter" that he survived as he reveals that Clay did not kill him but removed his genitalia by cutting it off. He then fights Logan Jonsen to get his revenge on the pack for doing what the did to him. Luckily, Logan manages to chock him out before he transforms in front of a crowd in the process. Logan then informs him about the Undoing and the effects it's having on the witches and werewolves. He also informed him about the witches dying, and that the curse on the werewolves was lifting, which means come the next day, they"ll either be human or wolf for the rest of their lives. Cain reveals to Logan that he's been keeping his girlfriend Amber on life support since she made it halfway through the change, which resulted in transition locking her into a twisted disaster of a body, making her become brain dead. Ultimately, he takes her off life support and says goodbye. He then decides to join the pack in order to stop Aleister and Clara's sinister plan to kill off the witches and take possession of Savannah's body.