The famous children's writer Tove Jansson invented the Moomins and their friends, who soon became famous throughout the world. Don't deny yourself and your children the pleasure of visiting the hospitable Moomin Valley. There is always something going on in Moomin Valley. Sometimes funny, sometimes very dangerous. And now, when there seemed to be no signs of trouble, it suddenly turned out that a huge, terrible Comet was threatening to hit the Earth! What will happen to the Valley, the cozy Moomin house and the whole Earth? One hope is that the professor at the mysterious mountain observatory will tell you what to do. And Moomintroll and Sniff bravely set off on a long journey, where they will have many adventures and fateful meetings.