Treehouse of Horror X was created on 1999-10-31.
Treehouse of Horror XI was created on 2000-11-01.
Treehouse of Horror XIII was created on 2002-11-03.
There are currently twenty-three Treehouse of Horror episodes. There will be a twenty-fourth one for the upcoming twenty-fifth season.
The Simpsons - 1989 Treehouse of Horror II 3-7 is rated/received certificates of: Argentina:Atp
Treehouse of Horror was created on 1990-10-25.
The Simpsons - 1989 Treehouse of Horror XII 13-1 is rated/received certificates of: Argentina:Atp USA:TV-PG (1997-Present)
Treehouse of Horror X was created on 1999-10-31.
Treehouse of Horror XVIII was created on 2007-11-04.
Treehouse of Horror VII was created on 1996-10-27.
Treehouse of Horror XIV was created on 2003-11-02.
Treehouse of Horror XIX was created on 2008-11-02.
Treehouse of Horror XVI was created on 2005-11-06.
Treehouse of Horror XXI was created on 2010-11-07.
Treehouse of Horror II was created on 1991-10-31.
Treehouse of Horror IV was created on 1993-10-28.
Treehouse of Horror IX was created on 1998-10-25.