Join Barney and the gang on a never-televised journey into the fascinating world of transportation. When Robert bends a wheel cleaning his grandfather's old bike, Barney suggests the kids visit with his friend Pop Wheelie. Pop absolutely loves wheels and anything that has to do with transportation--and he just happens to run a wheel factory colorful enough to be reminiscent of Willy Wonka's chocolate factory. As Pop's magical machine cranks out a new wheel for Robert's bike, Pop lets Barney and the kids test new wheels for his bus, ship, train, and planes as they learn about street and bike safety along the way. Lots of fun songs like "Wheels on the Bus" and "Down by the Station" accompany the kid's animated journeys and soon they're back in the tree house putting the finishing touches on Robert's newly renovated bike.