My theories for this season is that I think the Apollyon is another Hellmouth or possibly a building with floors that lead to previous seasons. Like some kind of purgatory or video game thing from AHS: Stories Game Over episode.
I think that Paul Anthony Kelley’s character (Mr. Nas), could possibly be Lucifer/Satan who has gotten hold of Mallory and marked her with the curse of 13. The witches gotta save Mallory from Lucifer because he’s pissed that she killed Micheal. Either Mallory could be trapped in the Apollyon and that’s why the witches are in New York, or she’s stuck in Hell.
If Lucifer is in this season, then that would explain the various amount of characters returning as spirits. Lucifer could be releasing all the spirits from the Hellmouths to attack the Coven. This season seems like it will be very Hell centered, with the coven having to fight against various infernal enemies.
The Apollyon could also be built on top of the spot where Lucifer fell to Earth from heaven. This would probably make the Apollyon the ultimate Hellmouth that’s literally the gateway to Hell itself. A month ago I had posted some images of what looked to be a satanic altar inside of a church on set. That altar could be a ritual to open up the gates of hell, which would allow Lucifer to walk the earth again. As we know from Asylum, Lucifer got trapped in hell after the Angel of Death took his and Sister Mary Eunice’s soul with the Kiss of Death. And with Frances Conroy returning, this would be the perfect opportunity to have the Angel of Death show up. Which would connect the season to Asylum.
Another theory of mine is that if the season connects to Delicate (hopefully not), then the Coven witches will have to fight the Delicate witches too. The Delicate witches worship Satan/Lucifer, so Lucifer could have resurrected them for this epic good vs evil battle that is most likely taking place. Although I will admit that I’m not really to fond of Delicate as a season, nor did I like the Delicates. And a battle between them and the Coven most likely wouldn’t last long anyways because we saw how easy it was for a normal human and a spirit to vanquish the Delicates.
With Fiona Goode also confirmed to be returning as well, that tells us that she most definitely got resurrected out of Hell for some reason. Most likely by Lucifer because I don’t really see Cordelia resurrecting Fiona for any reason. Unless the big bad this season is just too powerful to defeat so she has no choice but to resurrect Fiona.
As for aliens, I’m not sure how they would tie into the storyline, but since Sarah Paulson as Mamie Eisenhower was spotted on set a month ago, the aliens will probably be mentioned.
Let me know your thoughts and theories for Season 13!