Animated adventures of builder Bob and his friends - Travis the tractor, Scoop the bulldozer, Lofty the crane and Dizzy the cement mixer. Scoop has hayfever, so Bob sends him home. Bob sends Spud to the yard to look after Scoop. Delighted with his new job, Spud decides to find out what else makes Scoop sneeze. Wendy returns to the yard with some flowers from Mrs Potts' garden. Spud grabs them and makes Scoop sneeze! But Spud's behaviour soon lands him in trouble.