Treehouse of Horror XVIII

The 18th installment of the Treehouse of Horror series.
Mr. and Mrs. Simpson
A parody of the 2005 film Mr. and Mrs. Smith, featuring Marge and Homer as the title characters.
E.T. Go Home
Bart and Lisa help Kodos return to his home planet, but Kodos uses their assistance to secretly plan something sinister.
Heck House
Flanders decides to scare Bart, Lisa, and their friends straight after they go too far with their pranks.