And the “Mona-Mania!” continues!

We already know a little bit about Pretty Little Liars Season 3, Episode 15: “Mona-Mania!” And the clues just keep rolling in.

Read spoilers at your own risk! For more on Wetpaint Entertainment's philosophy on spoilers, click here.

Norman Buckley, director of Episode 15, recently tweeted a photo of PLL writer Bryan Holdman and the oh-so-familiar face of Annabeth Gish (Dr. Anne Sullivan) on set. Unless Annabeth was just swinging by to say "hi," this means Dr. Sullivan is back!

Here’s what we know about the good (or not-so-good) doctor: She first appeared in Season 2 as the Liars’ therapist. The girls seriously considered telling her about “A” before “A” beat them to the punch. Mona (Janel Parrish) paid her a visit, threatened her family, and made her skip town. The last time we saw the doc was in the Season 2 finale (Season 2, Episode 25: “UnmAsked”), after Mona was taken into custody.

Could Dr. Sullivan’s experience with Mona be the reason behind her return? What role could she play in all of the "mania"?

Perhaps she's brought in for her expert opinion on Mona. Or maybe she’s not there for Mona at all. Is there someone else that could need Dr. Sullivan’s help? Or could she be in town for more nefarious reasons? Many fans still don't trust Dr. Sullivan, so it's possible her return will mean more trouble for the girls.

Find more Pretty Little Liars spoilers here.

Catch an all-new episode of PLL on Tuesday, August 14 at 8 p.m. ET/PT on ABC Family.

Source: Twitter

Samantha Highfill is a contributing writer to Wetpaint Entertainment. Follow her on Twitter at @samhighfill.

Want more Pretty Little Liars? Like us on Facebook and Follow us on Twitter and Tumblr.