13 of the Most Terrifying Moments From Pretty Little Liars

It's not until the end of this episode that we find out the truth of Ali's breakdown. She's not being visited by Wilden and Jessica DiLaurentis's ghosts; it's just Mary Drake and Dr. Rollins in disguise. Even so, before the truth is revealed, it's like Ali's living a real-life zombie apocalypse, and the terror for the audience is just as real.