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The Simpsons' Treehouse of Horror 23 is the twenty-third and final issue of the Bart Simpson's Treehouse of Horror comic book series. It was released on September 20th, 2017.
As children, Marge, Homer, Lenny, Carl and Barney were tormented by a clown that lived in the sewer. Together they defeated the face-painted fiend. Now as adults, they are about to be tormented by the same clown again. Sometimes “IT Happens.” Then, Comic Book Guy gets a well-deserved curse placed on him by an unsuspecting citizen of Springfield. And finally, Marge is the only one standing between her family and a fungal invasion from space!