"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 was filmed nine days before airing. It features guest appearances by James Earl Jones and Carrie Fisher. In contrast to previous guest stars, Jones takes a liking to Sheldon (Jim Parsons) and the main plot is focused on the two having a night out together. Fisher appears when Jones suggests they knock on her door and run away. The episode received high ratings and mainly positive reviews, with many complimenting the cameo appearances. Plot Leonard (Johnny Galecki), Sheldon, Raj (Kunal Nayyar) and Howard (Simon Helberg) are in Leonard and Sheldon's apartment, waiting for Comic-Con tickets to go on sale online. After ten minutes of trying, tickets run out and the four men are disappointed that they will not be able to attend, especially as they had spent so much time on their costumes, intending to go as different versions of the Hulk as portrayed by Lou Ferrigno, Eric Bana, Edward Norton, and Mark Ruffalo. Sheldon decides to set up his own Comic-Con, and tries to convince several celebrities to appear, including Stan Lee, Bill Nye the Science Guy, Leonard Nimoy, and Wil Wheaton. Since Wil is unavailable and Sheldon has restraining orders from Lee, Nimoy, and Nye, he asks Leonard to contact them. Leonard, Raj, and Howard attempt to solve their Comic-Con problem by illegally buying scalped tickets. After arranging for a scalper to come to the apartment, they begin to get worried, remembering Sheldon's warning that they could get charged for petty theft, then have to disclose the crime in the future. When the scalper is heard arriving, they quickly turn off the lights and stay silent. Sheldon discovers James Earl Jones, whom he reveres for voicing the Star Wars villain Darth Vader, is going to a sushi restaurant, where Sheldon meets him. Unlike many celebrities Sheldon has met, Jones eagerly welcomes his company. Sheldon asks Jones questions about himself and he confirms that he was functionally mute for eight years, he was a pre-med in college, and that sound designer Ben Burtt used scuba equipment to create the sound of Darth Vader's breathing. The two spend the night doing various activities at an ice-cream parlor, a carnival, a strip club,