11/20/2012 09:49 am ET Updated Dec 06, 2017

'Pretty Little Liars' Season 3: Ashley Benson, Lucy Hale Tease New Episodes (VIDEO)

A's work is far from done.

In the new teaser trailer for "Pretty Little Liars" (returning on Jan. 8 at 8 p.m. ET), Lucy Hale, Ashley Benson, Troian Bellasario and Shay Mitchell tease more dramatic episodes as the gang continues to reel from the discovery that A is Mona (Janel Parish) and try to figure out who else is working to take them down.

Check out the promo below.

Based on the novels by Sara Shepard, the ABC Family series centers on the lives of four popular girls -- Spencer (Bellisario), Hanna (Benson), Aria (Hale) and Emily (Mitchell) -- whose clique falls apart when their "queen bee" Allison disappears.

The return of "PLL" will also bring a new guest star: four-time gold medalist Missy Franklin. According to TV Guide, Franklin will play herself in an episode in which Emily (Shay Mitchell), who is also a swimmer, happens to run into her at The Brew.

"Pretty Little Liars" returns on Tues., January 8 at 8 p.m. ET on ABC Family.

2012 Renewal Index: Canceled, Safe and on the Bubble Shows