"Pretty Little Liars" season 7 came back with a bang and things are about to get even more intense as the show heads toward the finale. In episode 12, the show will introduce a new bully, in the form of a sharp-tongued teenager.

In TVLine's exclusive sneak peek at this season's twelfth episode, Emily (Shay Mitchell), now a swim coach, is seen confronting a student, Addison (Ava Allen), for missing practice without a valid excuse. The teenager gives her a bunch of sassy responses, which leads Emily to thinking that she sounds a lot like high school Alison (Sasha Pieterse), who is now a teacher at Rosewood High School, or even worse. "At least when I threatened adults, I looked up from my phone," Alison tells Emily after hearing the heated exchange between the coach and the student.

Apart from being the new mean girl in town, there are speculations that Addison could be part of AD's evil plan. The teenage Alison 2.0 happens to be both on Emily's swim team and in Alison's class. Is it just a coincidence or part of the enemy's scheme? Based on the teaser video, wherein she is seen eavesdropping on their conversation about Alison's secret pregnancy and saw the two hugging, it looks like she's going to cause some trouble for the Liars.

In other news, Jenna (Tammin Sursok) is back in town and is about to stir up drama in the next episode. The trailer for "Pretty Little Liars" season 7 episode 12 suggests Jenna brought new revelations with her return. In the video, she is heard saying, "I need to tell somebody the truth. Noel wanted to kill me too."

Whether this is a new revelation or just another lie because she's still working for the mysterious AD, viewers will have to wait and see.

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