When a royal family from overseas visits North Philly, the boys are eager to meet them. A minor incident sees Rudy stumbling across the eldest child, Prince Corbin, and the two discover that they look very identical to each other. Corbin gets the idea to switch places with Rudy for a week, resulting in living each other's lives to see how different it is from their own lives.
Fat Albert and the kids are tired of Rudy's pranks so they decide to get some payback. This is based on the classic cartoon, and of course, I don't own anything.