Joseph Gordon-Levitt as George on Roseanne (1993-1995)
While most memorably rising to fame in underrated show, 3rd Rock From the Sun, one of Joseph Gordon-Levitt's early high-profile roles was a four-episode run playing annoying, penny and nickel-collecting neighbor, George, on Roseanne way back in 1993. We're surprised he's been around that long, too.
Gordon-Levitt is now a legitimate Hollywood leading man, spawning a generation of sensitive of dudes hiding their copy of (500) Days of Summer inside a DVD case for The Departed, to delivering one of the most obvious lines in film history, when he announces he's Robin in The Dark Knight Rises. Not to mention, he's got the 'affable' romantic role on lock until 2050.