Boog, a domesticated 900lb. Grizzly Bear finds himself stranded in the woods 3 days before Open Season. Forced to rely on Elliot, a fast-talking mule deer, the two form an unlikely friendship and must quickly rally other forest animals if they are to form a rag-tag army against the hunters.
After falling head over hooves in love with Giselle, Elliot's road to the altar takes a slight detour when Mr. Weenie is kidnapped by a group of pampered pets determined to return him to his owners.
When Boog's pals choose their family obligations over the annual guy's trip, a disappointed Boog takes a trip of his own, which leads him right into the middle of a circus ring. When he switches places with a devious look-a-like circus grizzly and falls for an alluring Russian troupe member, his friends rally to bring him home.