October 30th, 2011
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.
Treehouse of Horror XII was created on 2001-11-06.
There are currently twenty-three Treehouse of Horror episodes. There will be a twenty-fourth one for the upcoming twenty-fifth season.
Treehouse of Horror XXII was created on 2011-10-30.
The Simpsons - 1989 Treehouse of Horror XXII 23-3 was released on: USA: 30 October 2011 Hungary: 4 November 2012
November 7, 2010
Treehouse of Horror was created on 1990-10-25.
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.