In the twelfth Treehouse of Horror episode, there are three stories: 
Hex and the City – Homer angers a gypsy, who gets revenge by cursing him. 
House of Whacks – Marge buys a HAL-style computer system for the house and picks the Pierce Brosnan personality, who immediately takes a shine to Marge, and attempts to murder Homer. 
Wiz Kids – In this Harry Potter parody, Bart and Lisa go to a school for wizards, and Lord Montemort (Mr. Burns) uses Bart to capture Lisa's magic.

Other Connections and Related Pop Culture

The Simpsons Season 13

# Title Air Date
The Simpsons
13:1 Treehouse of Horror XII Nov 6, 2001
13:2 The Parent Rap Nov 11, 2001
13:3 Homer the Moe Nov 18, 2001
13:4 A Hunka Hunka Burns in Love Dec 2, 2001
13:5 The Blunder Years Dec 9, 2001
13:6 She of Little Faith Dec 16, 2001
13:7 Brawl in the Family Jan 6, 2002
13:8 Sweets and Sour Marge Jan 20, 2002
13:9 Jaws Wired Shut Jan 27, 2002
13:10 Half-Decent Proposal Feb 10, 2002
13:11 The Bart Wants What It Wants Feb 17, 2002
13:12 The Lastest Gun in the West Feb 24, 2002
13:13 The Old Man and the Key Mar 10, 2002
13:14 Tales from the Public Domain Mar 17, 2002
13:15 Blame It on Lisa Mar 31, 2002
13:16 Weekend at Burnsie's Apr 7, 2002
13:17 Gump Roast Apr 21, 2002
13:18 I Am Furious (Yellow) Apr 28, 2002
13:19 The Sweetest Apu May 5, 2002
13:20 Little Girl in the Big Ten May 12, 2002
13:21 The Frying Game May 19, 2002
13:22 Poppa's Got a Brand New Badge May 22, 2002

 

The Simpsons:
Season:  11  / Episode:  4 
Treehouse of Horror X

 

The Simpsons:
Season:  12  / Episode:  1 
Treehouse of Horror XI

 

The Simpsons:
Season:  14  / Episode:  1 
Treehouse of Horror XIII

 

The Simpsons:
Season:  21  / Episode:  4 
Treehouse of Horror XX

 

The Simpsons:
Season:  22  / Episode:  4 
Treehouse of Horror XXI

 

The Simpsons:
Season:  23  / Episode:  3 
Treehouse of Horror XXII

 

The Simpsons:
Season:  24  / Episode:  2 
Treehouse of Horror XXIII


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