Spencer Hastings is done playing Mona Vanderwaal's games. In a sneak peek from the Feb. 12 episode of Pretty Little Liars, Spencer (Troian Bellisario) confronts her arch-nemesis (Janel Parrish) and threatens to expose her true identity as a member of the villainous A-Team.

"I really want to thank you for sending the good doctor to my rescue," Spencer says of Wren Kingston (Julian Morris). "We know why you called him: he gives really good intervention."

Leaning in close, Spencer continues, "Actually, part of my treatment plan requires me to read a case study all about a deeply disturbed teenager. Wren seems to refer to her as M, but we both know that this sociopath goes by other initials as well."

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Scowling, Mona replies, "Sounds riveting. But if you'll excuse me . . . "

"I do wonder, though how anonymous this patient can stay once I upload the entire case load on the internet with your photo attached," Spencer says.

Mona, appearing unfazed, looks Spencer directly in the eye and says, "And who's looking cray-cray now, Spencer? Have you completely lost it? Is that why Toby left you?"

"According to your records, Toby was never with me," Spencer says of her ex-boyfriend, who was recently revealed to be a member of the A-Team. "But my friends still are, Mona, and you are not taking away any more of them."

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"And yet I don't see any of them here now," Mona retorts. "Do you still have any friends, Spencer?"

Pretty Little Liars airs Tuesdays at 8 p.m. EST on ABC Family.

This article originally appeared on Usmagazine.com: Pretty Little Liars: Spencer Threatens to Reveal Mona's A-Team Identity