The creepiest part of the Riverdale season three trailer? That one shot where it looks like Polly and Alice are holding up Polly's babies in front of a bunch of white-clad people and a fire — that seemed pretty cult-like to me! It would also tie in with Polly's mentions of the mysterious "farm" late in season two. It could be anything from a satanic cult to a doomsday one, or some other brand of creepy, but the one thing that's for sure is that, whoever they are, they're going to spell trouble for our heroes.