XVI: Bart falls into a coma and is replaced by a well-behaved robot. Homer takes part in a deadly TV game show. And Lisa turns into Albert Einstein. (S17 Ep4/22) [AD,S]
XXV: Bart and Lisa are taken to a demonic alternate universe, Moe leads a terrifying Clockwork Orange-style gang, and the Simpsons are haunted by ghosts. (S26 Ep4/22) [AD,S]
X: Ned comes back to haunt the Simpsons after Marge accidentally runs him down, and Bart and Lisa get zapped by radiation and become superheroes. (S11 Ep4/22) [AD,S]
VII: Settle in for a night of back-to-back Treehouse of Horror episodes! Bart finds his evil twin, Lisa becomes a God, and Kang and Kodos become Bill Clinton and Bob Dole. (S8 Ep1/25) [AD,S]