Tumbler the big and boomy cement mixer arrives in the Valley to help build the Bobland Bay skate park. Dizzy is given the job of showing him around. Tumbler's larger than life arrogance becomes a little too much for dizzy and Tumbler is soon all alone in Sunflower Valley. By displaying a little humility, he finds his way back to his new friends and that life in Bob's team is so much nicer!