The billy goats want to get across the bridge so they can eat grass on the other side, but they think there's a grumbly, grouchy, bully of a Troll under the bridge who is determined not to let them pass. Actually, the Troll is not a bit mean-- he just wants someone to play with! They do finally get across, but not until after they learn some manners -- and make a new friend in the process.
