THE SIMPSONS--The longest-running scripted series in American primetime television history has entered its 21st year and shows no signs of slowing down. A counter-culture cartoon which has become a cultural institution, the Simpsons is a worldwide phenomenon, skewering all who dare to cross its path. Guest stars this year include Seth Rogen, Jonah Hill, Anne Hathaway, Sarah Silverman, The Far Side's Gary Larson, Angela Bassett, The Smothers Brothers, The Manning Brothers--Peyton, Eli and Cooper, Coldplay's Chris Martin and the late Eartha Kitt. THE SIMPSONS is a Gracie Films Production in association with 20th Century Fox Television. James L. Brooks, Matt Groening and Al Jean are the executive producers. Film Roman, a Starz Media company, is the animation house.