Watch The Simpsons Season 18 full episodes online, free and paid options via our partners and affiliates.

Nelson Threatens Bart
Watch The Simpsons Season 18 Episode 8
"The Haw-Hawed Couple"
Original Air Date:

Bart becomes Nelson's best friend, and discovers how possessive Nelson can be. Meanwhile, Homer finds himself hooked on one of Lisa's fantasy books.

Watch The Simpsons Season 18 Episode 4
"Treehouse of Horror XVII"
Original Air Date:

The Simpsons' annual Halloween hodgepodge. Phil McGraw, Richard Lewis, Fran Drescher, Sir Mix-a-lot and Maurice LaMarche guest star.

The Simpsons Season 18 Quotes

My arm! It hurts where the tiger's biting it!

Bart

Tonight's G-rated jam is a silent film from my favorite yearYester.

Ned Flanders