Heath Ledger was the blonde, brown-eyed heartthrob that everyone had a crush on back in the '00s. Easy to write off as another one-dimensional pretty boy, he took on a lot of different roles to shake this stigma – including the Joker in The Dark Knight. Unfortunately, Ledger passed away before the film was ever released, but he remains one of the best villains to ever see the silver screen. In fact, his rendition of the Joker earned him a posthumous Oscar for best supporting actor.