Buster is a sweet little garbage truck. He can't wait to grow up to be a big truck, just like his father. Buster practices driving and lifting and beeping with his friend, Kitty. There's one small problem. Loud noises frighten Buster. When his father takes him to the truck yard to meet the other vehicles, their air-horn blasts and roaring engines send Buster skidding away to hide. He wants to be big and brave, but how can he work with Daddy and his friends when their loud sounds scare him? Buster feels terrible. When Kitty gets into trouble, little Buster musters up his courage to save her.