Jason Voorhees is the protagonist of the Friday the 13th franchise.
In Bart's daydream, he, along with Pinhead and a Math Book, attack Bart, only to be stopped by Santa's Little Helper in a Robocop-like outfit.
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After Marge locks Homer in the cellar he is unwillingly released by Moe, along with a band of demons including Dracula, the Mummy, the Wolfman, and Pinhead, despite wanting to finish eating before killing his family.
Jason was also sitting on the couch along with Freddy Krueger, who are both waiting for the Simpson family.