Terrifying Tales of Summerlands XXI

Treehouse of Horror XXI is the twenty-first Treehouse of Horror episode and the fourth of Season 22. It is scheduled to air on November 7, 2010.

Plot
thumb|left|250px|Promotional video for this episode

Master and Cadaver
Homer and Marge take a cruise together on a sailboat where a castaway disrupts their romantic getaway, like Dead Calm.

Tweenlight
Lisa Simpson falls in love with a vampire named Edmund. However, Homer and Edmund's father disapprove of their love and team up to try to destroy it - a parody of the Twilight saga.

War and Pieces
A story where games, such as chess and snakes and ladders come to life and a parody of The Office that takes place at Monster Mifflin in Transylvania with Frankenstein as the boss.