It may be hard to believe but The Big Bang Theory has now been one of TV’s number one comedies for twelve seasons! Since the series began it has changed the face of television comedies with a unique premise and a cast chemistry that is rarely seen. Through all the ups and downs and changes in the lives of Sheldon, Leonard, Penny, Howard, Raj, Bernadette and Amy, fans have tuned in loyally season after season, but after season 12 it will be time to say goodbye to the iconic series. If you have been a fan since the beginning, test your Sheldon-like knowledge of the show with this quiz!