The Big Bang Theory is an American sitcom primarily centered on Leonard Hofstadter and Sheldon Cooper. In Season 7, Even Sheldon has grown comfortable with a female companion, entering into a signed “Relationship Agreement” with neurobiologist Amy Farrah Fowler. In their free time, Leonard and Sheldon continue to enjoy weekly trips to the comic book store and fantasy role-playing games with their ever-expanding universe of friends, including fellow scientists Rajesh Koothrappali, Howard Wolowitz, and Howard’s microbiologist wife, Bernadette.