'Pretty Little Liars' Season 5 Spoilers: Mona's Twin Is Big A? Upcoming Reveal Excites Fans!

As "Pretty Little Liars" season 5 heads towards the finale, the identity of Big A has everyone talking, and some theories are too interesting to pass up.

On Tuesday, "Pretty Little Liars" aired a preview for episode 20 of season 5. Following this, fans posted theories on YouTube concerning the one tormenting the girls.

"Okay, I'm calling it," commented TheDoctorWho747.

"I know who Big A is as they will be revealed in this season finale. It will be Mona's twin. Janel [Parrish] said she would still be a regular next season but 'in a different way.' Big A will be revealed to the audience this season finale but not in a way we are expecting, according to the actor who plays Mike."

However, the identity of Big A might not be revealed during season 5. Recently, spoilers on E! Online surfaced that came directly from Marlene King regarding the Big A.

"I know a lot of people were afraid that they would have to wait until the end of season 7 to find out who Big A is, and we made it clear that they don't," said King. "You will find out before season 7 and the story of Big A."

Needless to say, King is rather excited to dive into the backstory of Big A, and so do we.

"I can't wait to share the story," continued King.

"The identity of Big A is really cool, but to me, what I always loved most about Big A is the story of Big A, the motivation, what's behind it all. I haven't been that excited to share something with the fans since Mona's reveal."

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