9. Bill Hader
In his own understated way, Hader has become one of America's best comic actors. On Saturday Night Live, he's infinitely versatile and a master impressionist: His Alan Alda is dead on, his versions of Al Pacino and Keith Morrison (of NBC's Dateline) are howlingly funny, and his over-the-top take on Democratic strategist James Carville is so good that no one else should ever attempt an imitation of the Ragin' Cajun. Then there's Stefon, the flamboyantly gay Weekend Update "city correspondent" who hypes increasingly bizarre New York nightclubs (one features "DJ Baby Bok Choy" a giant 300-pound Chinese baby who wears tinted aviator glasses and spins records with his little ravioli hands"). It's SNL's weirdest and greatest character in years.