Saturday and Sunday are still lounging about when they are summoned to a grand debate. The island's populace is being threatened by an invisible monster and no one agrees about how to best deal with the disaster. Rallying around Sunday's opinion, which consists in the idea that "living outside is pretty cool," the young inhabitants leave their underground lairs and discover freedom. Meaning that they create major chaos and gorge themselves on suspicious-looking mushrooms. In the meantime, Saturday falls head over heels for a woman in a red dress. It's all very funny and tender — no debate about that.