When the scatterbrained but prepetually enthusiastic inventor Doc moves into an old workshop with his faithful dog Sprocket, we discover that he is not alone and there are a race of strange creatures known as Fraggles living in a cave that connects to the workshop through vents. Meanwhile, Gobo's Uncle Traveling Matt is about to start his great adventure into outer space.

Doc's effort to improve the plumbing in his workshop makes waves throughout the World of the Fraggles, Red has a one Fraggle swimming extravaganza.