Season 21, Episode 4 Treehouse of Horror XX
First Aired: October 18, 2009
In "Treehouse of Horror XX," Lisa is drawn into a Hitchcockian revenge plot when she isn't chosen for an academic honor; Krusty invents a ghastly fast-food item that unleashes a plague of zombies; and Moe's microbrew has a vile secret ingredient.
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- Premiered: December 17, 1989
- Rating: TV-PG
- Premise: Matt Groening's subversive, animated satire about Springfield's hapless first family became a cult favorite when it premiered on Fox in 1989 after first being seen in 1987 as a short on 'The Tracey Ullman Show.' That was then; now it's TV longest running c… (more)