Penelope is having a birthday party and everyone is invited. But as her parents quickly realize, Penelope really did invite everyone. As ballerinas leap through the air, ponies meander through the kitchen, soccer players kick penalty shots in the living room, and an elephant makes himself at home, Penelope's flabbergasted parents find increasingly dramatic words (outrageous ... ridiculous ... preposterous) to describe the growing chaos. Even though Penelope meant well by not leaving anyone out, it's clear that this birthday bash has gone berserk ... bonkers ... bananas!