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In this spoiler photo, Lucas is standing opposite one of the anonymous baby-face monsters from the Season 2 Halloween prequel (Season 2, Episode 13: ”The First Secret”). In that creepy episode, someone dressed in the same costume seemed to be stalking Alison (Sasha Pieterse) everywhere she went. And at the end, the Little Liars realized that there was more than one baby-faced monster at Noel’s (Brant Daugherty) Halloween party.
Who these creepy characters are is still a mystery, but whoever they are, they’ve survived for over a year. Hopefully we’ll get some more information once Pretty Dirty Secrets begins!