Has it really been 800 episodes of The Simpsons? To celebrate this massive TV milestone, the long-running animated legend is rolling out an all-star guest cast, because if you’re turning 800, you don’t do it quietly. They’ll also handle a new take on the end-credits music, officially making this the smoothest Simpsons episode in history. The 800th episode airs Sunday, February 16, and sends the Simpson family to The National Dog Show in Philadelphia. Happy 800, Simpsons.