24 great sci-fi guest stars from 500 episodes of The Simpsons

Sunday, The Simpsons hit a milestone few television series in history can ever dream of, airing its 500th original episode since its premiere in December 1989. That's a lot of TV, and for a show like The Simpsons, that means a LOT of guest stars.



The series actually holds the record for most guest stars in a TV series, so it's no surprise that more than a few of them turned out to be sci-fi icons. Here's a look back at the biggest of those icons and the episodes they appeared in.

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