The special is divided into three main segments, each parodying classic horror tropes:

The special marks a nostalgic return to Duloc, which has since become a creepy ghost town. Shrek challenges Donkey, Puss in Boots, the Three Little Pigs, and the rest of the gang to a "Scary Story Contest" inside Farquaad's rundown castle. The winner—the last person to stay in the castle—is crowned the King of Halloween. The Stories Within the Story

The Ultimate Guide to Scared Shrekless : DreamWorks' Spookiest (and Funniest) Halloween Special

Scared Shrekless is a 2010 computer-animated Halloween special that proves ogres really are the "kings of Halloween". Set shortly after the events of Shrek Forever After , the special follows Shrek and his fairytale friends as they spend the night in Lord Farquaad’s abandoned, haunted kingdom of Duloc to see who can tell the scariest story without getting eliminated. The Spooky Setup: Duloc Revisted