20. The Genesis Tub, ToH VII
Lisa creates a microscopic society in a petri dish. It’s not the spookiest Treehouse of Horror but it is full of great jokes and some very clever satire of religion and God.
19. Starship Poopers, ToH IX
Kang comes to the Simpsons to reclaim his daughter – Maggie! A brilliant premise, culminating in a crossover with Jerry Springer. “Look Marge, Maggie lost her baby legs.”
18. I Know What You Diddly-Iddly Did, ToH X
The Simpsons murder Flanders in a hit and run accident and are haunted by a ghoul who somehow knows that they did. A nice little mystery that’s actually pretty scary.
17. Hell Toupee, ToH IX
Homer’s new wig – the hair of Snake Jailbird – possesses him and tries to murder Bart. Another scary one – it’s genuinely chilling to see an out-of-character Homer try and kill his son.
16. Homer3, ToH VI
The Simpsons goes CGI, as Homer escapes into the third dimension. Sure, it’s mostly just a way to show off the then state-of-the-art computer animation but it’s still very enjoyable.