Bob and Bobbie left their trailer to go skinny-dipping, and putting Mr. Weenie in charge to guard the cinnamon buns they left on the counter. When Boog and Elliot sneak into the camp, they are excited to discover that there are buns in the trailer. Unfortunately for them, Mr. Weenie is guarding the door.

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.