FOX has been teasing the 666th episode of “The Simpsons” since this past July, but we now have full details on “Treehouse of Horror XXX”, which will spoof everything from Guillermo del Toro’s The Shape of Water to Netflix’s “Stranger Things”.

The 30th “Treehouse of Horror” features a demon Maggie, a mission to rescue Milhouse from another dimension, dead-Homer’s spirit trying on some new bodies for size and Selma finally finding love in an unlikely place – the alien in the basement.

The episode will air Sunday, Oct. 20th (8:00-8:30 PM ET/PT) on FOX.

Here’s the previously released poster art for the episode that will go to Springfield’s Upside Down.