Paige (Lindsey Shaw) and Mrs. Grunwald (Meg Foster) are back in Rosewood in the upcoming episode 8, titled "Exes and OMGs," of the seventh season of the American thriller "Pretty Little Liars."

Without any warning, Emily's (Shay Mitchell) ex-girlfriend Paige returns to Rosewood. When Emily is applying for the Rosewood High swim coach position, she will be surprised to learn that Paige is also eyeing for the spot.

Not only is Paige in town, but the mysterious Carla Grunwald is also back. Hanna (Ashley Benson) gets a visit from Mrs. Grunwald since she gets a vision of the liars trapped in a complicated situation.

Curious about Mary's (Andrea Parker) baby being delivered to the liars, the girls will attempt to search for the whereabouts of the doctor to find answers. Ali (Sasha Pieterse), on the other hand, is desperate to put things in her life back to normal so she decides to return to work.

The promo trailer for "Exes and OMGs" shows Mrs. Grunwald warning Hanna that the threat is close to her. Then, Noel appears to Hanna's midst. The girls question his intentions this time. The girls are still tailing the Killer's movements, which is one step ahead of everybody else. Before the clip ends, it looks like another character's life is in danger.

In other news, the second half of season 7 will be introducing a new face. Even though the liars are being terrorized by the mystery killer, another villain is set to make things even harder for the girls. "The Middle" star Ava Allan joins the cast of "Pretty Little Liars" for a recurring role named Addison. According to Deadline, her character is described as an attractive, entitled, manipulative, and intimidating high school bully. It will soon be revealed if the second half of season 7 will have a five-year time jump to the girls' high school days.

"Pretty Little Liars" season 7 airs Tuesdays at 8 p.m. on Freeform.