Lionel the monster finds it hard to make friends. Children are frightened of him, because, well, he is a monster. Grown-ups are too busy even to notice him. Then one day he meets a little dog who isn't frightened, and isn't too busy, and who just wants to play! Lionel has never had so much fun! But what will happen when Lionel takes the little dog back to its owner? Is Lionel destined to be lonely forever?