Fatou is sad. She would so much like to have a white Christmas. Roger can fix that with his FroZen machine, which is going to make it snow on Kooh-Los, throwing all the animals into a state of frenzied joy! But the fun-filled afternoon full of snow games turns into a looming catastrophe when Roger lets go of a huge snowball from the top of the volcano. It rolls down the side, getting bigger and bigger on its way to destroying the lighthouse!