Seven Guest Stars Who Blew Our Minds on The Big Bang Theory

Charlie Sheen! Stan Lee! Bill Nye! Watch our favorite surprise celeb moments from the series

JAMES EARL JONES & CARRIE FISHER

It's a Star Wars reunion when James Earl Jones (the voice of Darth Vader) and Carrie Fisher (Princess Leia) both appear as themselves on episode 14 of season 7. Sheldon and Jones ride a Ferris wheel, bask in a sauna, karaoke to a Lion King tune (Jones was the voice of Mufasa) and ding-dong ditch Fisher's home. Who said Darth Vader never had any fun?