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1. Who did Alec Baldwin play when he guest starred on the show?
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2. What kind of creature did Mulder and Scully investigate when they came to town?
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3. Martin Sheen turned out to be playing the real version of which character?
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4. Who is Homer's long lost brother played by?
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5. Lucy Lawless showed up in what holiday episode?
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6. What singer offers her pipes for the advertisement Barney's rip off of Mr. Plow?
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7. Who did John Goodman play during his guest starring episode?
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8. Stephen Colbert has guest starred in an episode.
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9. Who plays the dramatized Lifetime villain version of Homer in "Homer Badman?"
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10. What terrifying character did Penny Marshall show up as?
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11. What famous elderly actress acted the heck out of Mrs. Glick?
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12. What musical duo helps Lisa come to terms with her desire to be a vegetarian?
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13. What phone service does Mark Hamill show up as himself to make fun of?
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14. What slang phrase did Lisa Kudrow bring to her role as a Springfield Elementary mean girl?
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15. Who did J.K. Rowling say Harry Potter would end up with romantically when she guest starred?
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16. Which Golden Girl visited in the episode "Missionary Impossible?"
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17. Who did Sam Neil, of "Jurassic Park" fame, guest star as?
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18. Jeff Goldblum showed up once as ____________'s agent.
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19. Which Beatle is seen going through his fan mail?
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20. What fictional band has popped up on the show?
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21. Who plays Sideshow Bob is his seemingly infinite appearances?
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22. Who does Marge go on a crazy "Thelma and Louise"-themed adventure with?
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23. Which "How I Met Your Mother" actor popped up in early Simpsons episodes?
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24. Which game show host has threatened Marge?
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25. What sweet treat does Homer ask George Harrison about?
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26. A large part of what '80s sitcom cast popped up for an extended cameo?
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27. Which astronaut has ben annoyed by Homer?
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28. Which Roseanne star came by for Bart to crush on?
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29. Who plays the country singer that tempts Homer?
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30. What late night show host gets to taunt Bart?
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31. Who narrates "The Raven" segment during a 'Treehouse of Horror" episode?
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32. Which '60s Batman actor graced the screen with his presence and played himself?
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33. What holiday does Barry White show up for?
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34. Which famous scientist accompanies Homer to Moe's?
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35. Who plays the co-worker Homer almost cheats on Marge with?
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36. Johnny Cash appears as ______________.
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37. Which famous singer showed up but didn't play himself?
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38. Meryl Streep played Bart's ____________.
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39. Who plays Hugh, the man Lisa almost marries in the future?
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40. Who does Patrick Stewart play?
The Simpsons may have had their fair share of adventures with the residents of their town, but that didn’t mean the people who stopped by for only one episode were any less interesting. In fact, many celebrities have lent their voices to characters and even voiced exaggerated versions of themselves. Do you remember all of the greatest famous Simpsons guest stars? Read more