Amy Farrah Fowler is one of the main characters of The Big Bang Theory. She is Sheldon Cooper's girlfriend, and has been since the end of Season 3 (The Lunar Excitation). In that episode Howard Wolowitz and Rajesh Koothrappali sign Sheldon up for internet dating, and Amy chose Sheldon. She appears at the end of the episode. Amy is also very close to Penny and Bernadette Rostenkowski-Wolowitz.