The Greatest Simpsons Celebrity Cameos 5.00K ian spiegelman 05/11/08 12:36PM Filed to: D'oh! D'oh! The Simpsons Television bart Homer Media Entertainment Weekly is ranking the best guest stars to appear on The Simpsons. How the hell did they miss Ron Howard and Mel Gibson? And Mr. Burns' whole ringer baseball team? See who else they snubbed here.