The squirrels of the Grumpy Woods have finally finished gathering their nuts for winter, when the Super Happy Party Bears find their stash…and eat the whole thing. To make it up to them, the bears show the squirrels another hoard they’ve found—one that belongs to the chipmunks! Suddenly, the bears' huge appetite has caused an all-out civil war between two rival nut hoarders: the Puffy Cheeks (the chipmunks) and the Twitchy Tails (the squirrels). Can the bears prevent the Grumpy Woods from getting too nutty?