Isaac is initially introduced in season two as a student at Beacon Hills High School, where he becomes a member of the lacrosse team. He is depicted as quiet, reserved, and somewhat mysterious, with a troubled past that is gradually revealed throughout the series. Isaac is initially portrayed as a victim of abuse at the hands of his father, who is shown to be both physically and emotionally abusive towards him. As a result, Isaac has trust issues and struggles with his own sense of worth.