Cartoon adventures of builder Bob and his friends - Travis the tractor, Scoop the bulldozer, Lofty the crane and Dizzy the cement mixer. It's a scorching hot day and Bob is installing a garden pond for rock star Lennie Lazenby. Wendy is laying out a nature trail with Lofty, and they follow some ducklings to a duck pond which has dried up in the heat. Wendy takes the ducklings to Lazenby's house where they can swim in his pond. The ducklings are so happy there that Lenny says they can stay.