Which makes it all the more strange that one of the show’s most well-known characters was absolutely nowhere to be found in The Simpsons Movie: Bart’s mortal enemy Dr. Demento Sideshow Bob.

Read more: The Simpsons Showrunner Admits ... Kelsey Grammer did when he first played Sideshow Bob — former right-hand man to Krusty the Clown and Bart's ultimate arch-enemy.