On air for more than 30 years and still going strong, The Simpsons is the longest-running American sitcom of all time. During the years that the show has been captivating audiences around the world, a vast variety of celebrities have guest-starred, some playing themselves, and some playing other characters that make them a little difficult to recognize.
While it’s easy to remember the big names that have appeared as themselves on The Simpsons, it’s more difficult to remember the stars that played various characters across the many seasons, especially when those characters looked so different from them. Keep reading to see which 15 celebrities we totally forgot had guest-starring roles on The Simpsons. Get ready to go down memory lane and have your memory triggered!