It's Willie the Snow Seal's birthday and there is going to be a big party with singing and yummy cake. It's a good thing that Emmy and Max brought their skates, because Willy lives in a huge ice cave next to a frozen pond. Zak and Weezie are excited about the party too, except for one thing-they don't know how to ice skate! Their friends are happy to help them. Then in "The Shape of Things to Come," when Zak's new dragondisk gets all sticky and gooey in Marchmallow Marsh, the gang learns that the only way to clean it is to dip it in Crystal Fountain in the Cryatal Cave. Kristel, the door that guards Crystal Cave tells them when they arrive that they must find things that are the three shapes that she has on her door before she will grant them access.