12. Rob Stone
After Rob Stone played Kevin Owens, one of George and Marsha’s kids in “Mr. Belvedere,” his career floundered. Had his role as Louis Skolnick in the “Revenge of the Nerds” series panned out, he might have made it. As it turned out, that show (the TV series version of the movie) never made it out of the pilot phase. Stone acted in a couple of Matlock episodes, then switched over to the production side of entertainment. He last directed a series called “Shank!” in 2010.