Credit: Video Still

It's hard to believe, but the Pretty Little Liars Season 3 summer season is almost over. And you know what that means: Things are going to get very dramatic, very quickly.

In this preview of Season 3, Episode 11: “Single Fright Female” (airing August 21), we see Jenna (Tammin Sursok), of all people, warning Emily (Shay Mitchell) to be careful about who she hangs out with; Spencer (Troian Bellisario) telling Aria (Lucy Hale) "she may be 'A'"; and Spencer and Hanna (Ashley Benson) in big trouble!

Will the Liars be okay? Watch the preview below.

Credit: ABC Family © 2012 Disney ABC Television Group Photo: Pretty Little Liars Season Season 3, Episode 11 Preview: "A" Attack! (VIDEO)

Catch an all-new episode of PLL on Tuesday, August 21 at 8 p.m. ET/PT on ABC Family.

Rebecca Martin is an editor at Wetpaint Entertainment. Follow her on Twitter @BeccaMartin47.

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