Exclusive American Horror Story Video: Beware of the Trick-or-Treater From Hell!

It takes a certain kind of wacko to drop by American Horror Story‘s haunted mansion on a normal day — but on Halloween? Well, you have to be a seriously deranged person to go anywhere near that house of horrors on the last day of October.

Cut to this Wednesday’s episode — the first of a Halloween-themed two-parter — and look who’s venturing through the Harmons’ metal gates with plastic pumpkin in hand: The seriously deranged Larry Harvey (Denis O’Hare).

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And as you might expect, it’s not a handful of Jolly Ranchers or Hershey Miniatures that he covets. No, Ben’s stalker is in search of a treat that’s a little more, um, green.