Charlie, who is nervous about his first day of school, and Dumpy the Dump Truck, who is nervous about his first construction job, gradually adjust to their new settings after making new friends.
After Charlie and his grandfather fix up a rusty old dump truck, they use Dumpy to help Trundle the tractor, Bee Bee the backhoe, and Stinky the garbage truck build a new barn.
After a big storm is forecast for Apple Harbor, Dumpy and his friends make preparations on the farm and also help rescue a fishing boat that is standed at sea.
When Farmer Barnes tells his family that people are giving less to charity, and children in Africa need toys, they decorate Dumpy the Dumptruck and set off on the Apple Harbor Toy Drive.
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