'Pretty Little Liars' season 7 episode 8 spoilers: Are Noel Khan and Mary Drake related? Will Paige cause trouble to Emily?

The liars continue to experience the tension brought about by their most recent dirty secret, and now, old familiar faces are returning to instill more drama to their already pressure-packed existence.

In the upcoming episode of "Pretty Little Liars" titled "Exes and OMGs," Mrs. Carla Grunwald (Meg Foster, "Ravenswood") returns to Rosewood supposedly paying Hanna (Ashley Benson) a surprise visit. It turns out she had a vision showing the lives of the Liars in grave danger.

Paige (Lindsey Marie Shaw), who played Emily's (Shay Mitchell) ex-girlfriend on the series, would also be making an unexpected comeback. Apparently, she also applied for the coaching position that Emily applied for at Rosewood High. Now, the exes are back at it again, competing with each other like they did before, this time in a bid to coach the swim team.

The episode would also find the Liars going out of their way to look for the doctor who delivered Mary Drake's (Andrea Parker) child. They want to find out more about the child, possibly in the hopes of learning who it turned out to be.

A promo clip has been released for the episode. Check it out below.

In the clip, a distraught Hanna says that Noel Khan (Brant Daugherty) is A.D., the person behind everything. The fact that Mrs. Grunwald warns her that the threat against the Liars is close doesn't help. Hanna would bear her assumptions to her friends, telling them why she thinks Noel is A.D. and therefore, their main suspect. If Noel is A.D., and they have been suspecting A.D. as Mary Drake's child, could Noel be Mary's child?

The Liars later receive another threat from Uber A, and the clip shows Hanna and Caleb (Tyler Blackburn) hugging before a sinister looking Noel hits Caleb with his car. Did Noel kill Caleb? Why was he hit?

The answers would be laid bare when "Pretty Little Liars" season 7 episode 8 returns this Tuesday at 8 p.m. EST on Freeform.