A grizzly bear named Boog, domesticated by a park ranger, Beth, helps deer friend Elliot escape from the mullet-sporting hunter, Shaw. When the animals escape to the forest the pair become lost just as hunting season begins, made worse by the fact Boog doesn't know how to survive outside of his beloved ranch. Elliott and Boog develop a strong bond not only between themselves but also with the wild animals and attempt to drive the hunters out of the forest.

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 create a rag-tag army against the hunters.