In the tranquil town of Timberline, a 900-pound grizzly bear named Boog (portrayed by Robert Downey Jr.) has his perfect world turned upside down after he meets Elliot (portrayed by Jim Carrey), a one-antlered mule deer. After Elliot messes up Boog's nature show, they end up tranquilized by Boog's owner Ranger Beth and then her friend Sheriff Gordy tells her to release them into the Timberline National Forest before open season for only 3 days. But when hunting season comes, it is up to Boog and Elliot to rally all the other forest animals and turn the tables on the hunters. In the end, Boog decides to stay in the forest and says goodbye to Beth (who had returned to take Boog home).