Ashton Kutcher and Charlie Sheen, Two and a Half Men

It's no easy task to fill a tiger blood-fueled warlock's shoes, but Kutcher's bumbling Walden Schmidt did his best. Extra points for doing away with the shaggy facial hair and not sleeping around (as much) as Charlie Harper did. But you know what would help exorcise the Ghost of Sheen Past? If the show doesn't constantly keep concocting plots about the late bachelor.