 " The Convention Conundrum " is the 14th episode of the seventh season of the U.S. sitcom The Big Bang Theory and the 149th episode of the show overall . It first aired on CBS on January 30 , 2014 . The episode features guest appearances by James Earl Jones and Carrie Fisher . In contrast to previous guest stars , Jones takes a larger role in the episode .
The episode begins with Sheldon, Amy and Penny playing a game of Rock-Paper-Scissors to decide who will go on a date with a man Amy met at a party. Penny wins and goes out with him. Later, Sheldon is anno