He may be best known as Luke Skywalker in George Lucas's classic "Star Wars" trilogy, but to comic book fans, Mark Hamill is just as well-known as the voice of the Joker from the critically-acclaimed "Batman: The Animated Series" and he's still doing the voice of the Joker today for projects like the upcoming "Batman: Arkham City" video game. He's also done the voices for several other comic book characters, such as the Hobgoblin on Fox Kids' successful "Spider-Man: The Animated Series", the Gargoyle on UPN's "The Incredible Hulk" animated series, and the Red Skull for Cartoon Network's "Super Hero Squad Show". Today, he turns 60. Happy birthday, Mr. Hamill!