For non-nerds: Wozniak co-founded electronics giant Apple with Steve Jobs (that guy who's always wearing black turtlenecks) and Ronald Wayne. He's appeared on a couple of other TV shows, most notably Kathy Griffin: My Life on the D-List (when he dated Kathy) and the American Dancing with the Stars.
So will Woz play himself in Big Bang? And how will he interact with super-nerds Sheldon (Jim Parsons) and Leonard (Johnny Galecki)? Series creators Chuck Lorre and Bill Prady refused to divulge any more details about the cameo when they appeared recently at San Diego Comic-Con.
They did, however, reveal that past guest stars Laurie Metcalf, Christine Baranski and Mayim Balik (BLOSSOM!) will all be back in season four.