All the little creatures on Brockie field decide to build an ark together. They then set sail down the stream until they come to a lake. They have some problems on the way when they come to a low bridge but they solve them. When they arrive at the lake they spend the day having fun. Milly Mole then gets into some trouble and the little creatures all help her. A storm then starts as they are about to sail home. They have to make a sail for the ark before they cane sail back home.