Tramp appears to be the ideal choice sor a starring part in a Hollywood film, and accompanied by Bub, Robbie and Chip, he goes to the tinsel town capital of the film world for an audition and screen test for a feature called 'Moon Dog'.

Mark Twain's stories inspire Chip, Ernie and Melinda to re-enact the adventures of Huckleberry Finn, Tom Sawyer and Becky when the youngsters run away from home to the river where they find a few adventures of their own.