5 Mind-Melting Twists to Remember From the Pretty Little Liars Finale

Altogether now: say whaaat?! We've been waiting years for a twin to pop up on Pretty Little Liars. It's such a huge part of the book series, and there's a ton of twin imagery throughout all six seasons. Did we ever suspect it would be Mrs. DiLaurentis, though? We definitely thought she might be "A" at one point, but we never saw her as a twin.

Not only is Mary Drake a twin, we also learn she's the biological mother of Charles, that she's working with Dr. Rollins, and that she's desperately trying to gain control over the Carissimi group. It also seems like she's trying to get revenge for Charlotte's death. Which kind of leaves us wondering, still, after all this time: who killed Charlotte?!