CeCe’s identity as “A” may have been discovered during the summer finale of “Pretty Little Liars,” but that doesn’t mean that the girls are safe. A new villain is out to torment Alison (Sasha Pieterse), Aria (Lucy Hale), Emily (Shay Mitchell), Hanna (Ashley Benson) and Spencer (Troian Bellisario) in Season 6 -- and that mysterious person is related to a character on the show.

Those that caught the summer finale will remember that the show jumped forward five years. While Aria, Emily, Hanna and Spencer had all left Rosewood, they returned to help Alison, who became a teacher at the high school. Although she’s now known as Mrs. Rollins, Alison is still in danger. The finale ended with the girls racing into her classroom to warn her that she’s in trouble and that “He” is already there.

Speaking with TV Guide, cast members of “Pretty Little Liars” teased that while CeCe (Vanessa Ray) was “playing a game” with the girls, this new villain is the opposite. While he will “communicate similarly,” he will also make himself known as a new player with new tricks.

“This isn’t just for Charlotte’s fun,” Pieterse explained. “This new person is deadly.”

Fans of the ABC Family series (the network is changing to Freeform in January) will have to tune in to find out why the villain is tormenting Alison, Aria, Emily, Hanna and Spencer. But it seems safe to say that it involves the many secrets that each of them has.

As previously reported, show creator Marlene King revealed in the “Pretty Little Liars: Five Years Forward” special that Emily will return with the “biggest baggage.” That doesn’t mean that the other girls are innocent though. Executive producer Oliver Goldstick told TV Guide that the big question is “how much” does this new villain know about the girls – and what is he going to do with that information.

Right now fans don’t know who the big bad is, however, King did drop one big hint: “Pretty Little Liars” viewers will know who he is related to by the end of Season 6. So, who could it possibly be? We’ve got some ideas …

Mike Montgomery

Mike (Cody Christian) was sketchy in high school, which means he’s probably even sketchier as an adult. What’s important to remember is that he was close with Mona (Janel Parrish) and extremely upset when he found out that she faked her death. He could blame Aria and her friends and still be bent on revenge after all these years.

Wesley Fitzgerald

Ezra’s (Ian Harding) younger brother, Wesley (Gregg Sulkin), was introduced in Season 3 and hasn’t been seen since. But that doesn’t mean that he’s completely out of the picture. Since Ezra had all that high-tech spy gear he used to spy on Aria and the others, Wesley could have access to the same information. As for why he would torture the girls? Maybe something happens to Ezra and he wants revenge.

Wren Kingston

We still have SO many questions about Wren (Julian Morris). While the summer finale didn’t clear up any speculation about him working with CeCe, it’s possible that he could have still somehow been connected to “A.” The easiest answer to why he would be tormenting the girls is that they’ve caused nothing but trouble for him. But who exactly could he be related to?

We’ve got our theories -- but what about yours? Tweet your thoughts to @AmandaTVScoop. “Pretty Little Liars” Season 6 returns to ABC Family on Tuesday, Jan. 12, 2016 at 8 p.m. EST.