The Simpsons x Death Note is an Anime Treehouse of Horror Halloween Special
If you love The Simpsons and the anime Death Note, you're in for a treat!
One segment of the series' Treehouse of Horror Halloween Special is titled "Death Tome," where the Simpsons are drawn in anime style (by studio DR Movie, the same studio that worked on the Death Note series, so the animation is on point).
In the story, Lisa received a book called Death Tome and found that she could kill anyone simply by writing their name and manner of death in the book.
Besides the intriguing storyline, it's awesome to see Homer, Marge, Lisa, Bart and other characters drawn in anime-style. The episode is actually chockful of Easter Eggs - see if you can find minor characters from The Simpsons in the background of the scene.
The Simpsons writer Carolyn Omine tells the story of how the anime crossover happened:
One more The Simpsons x Death Note sneak peak: