I Faced Tahn-Enn-Bahm, The Christmas Tree From Another World

I Faced Tahn-Enn-Bahm, The Christmas Tree From Another World is a Bart Simpson's Treehouse of Horror story featured in.

Synopsis
Lisa discovers an evil alien masquerading as a Christmas tree, who plans on enslaving humanity.

Plot
The Simpson family buy a tree for Christmas; however, Lisa cannot identify its species. The tree reveals to her that it is actually an alien called Tahn-Enn-Bahm and is part of a race who plan on invading Earth and enslaving the human race. Lisa is unable to bring herself to destroy the tree because of her environmentalism and others refuse to believe her story. Homer accidentally kills Tahn-Enn-Bahm when he drops a bucket of water on a plug socket powering the Christmas lights. The tree aliens retreat in fear upon learning about Tahn-Enn-Bahm's death.