The Twirlywoos are on a beach watching a boy build sandcastles. He makes more and more sandcastles, and the Twirlywoos decide they want to help. They build more and more sandcastles too, and it's not long before the whole beach is full. On the Big Red Boat something's wrong with the fruit tea machine - it keeps producing more and more grapes but no tea! As the grapes turn into a great big bunch, it's up to Chickedy and Chick to try and fix it.