Mark Hamill by Gage Skidmore

Mark Hamill is an American actor. He is best known for his role as Luke Skywalker in the Star Wars franchise and for his voiceover work, his most notable role being the Joker in Batman: The Animated Series (and other Batman related media) and he is also known for voicing Skips in the acclaimed Cartoon Network series Regular Show. He provided the voice of Grubby.