Zack is a close friend of Joe's, and he, Cappy, Angus, and Joe hang out together almost every day, riding bikes, drinking beer, and talking about sex. Zack’s parents are divorced and Vince Madwesin is his stepfather. Grandma Ignatia Thunder is Zack grandmother, to whom Zack, Cappy, and Angus occasionally go in search of food. Zack is injured during the car accident that kills Cappy.