Acorn is a little wild, and from his oak tree perch, he longs for adventure. When he's the first of his friends to jump off the oak tree, he's on his way into the wide world, full of new experiences that fill his little heart with excitement!

But when a squirrel buries Acorn deep underground, the thrill-seeking Acorn finds himself forced to stay still, in the darkness, for a long time. To turn this biggest setback into a wild adventure, Acorn may have to change from the inside out.