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Looking to watch The Simpsons Season 21 Episode 4 online? TV Fanatic is your destination for every paid and free streaming option of the The Simpsons S21E4 full episode from 2 affiliates.

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Episode Details

The Simpsons Season 21 Episode 4: "Treehouse of Horror XX"

The annual Halloween special for the Simpsons is broken into three stories: Dial "M" For Murder; Don't Have a Cow, Mankind; and The Musical.