The penultimate episode of "Pretty Little Liars" season 6 is perfect to set the stage for the explosive finale of the season. The installment is titled "Did You Miss Me?" Here, the liars will attempt to stop the new enemy before things get out of hand.

The promo suggests that the upcoming episode will be packed with big moments. To begin with, Alison's life will be in danger. The clip shows the teacher being knocked unconscious after falling down the stairs.

This mysterious so-called accident ultimately pushes the girls to act upon what they believe will be a series of terror befalling them like a case of déjà vu.

"It's happening again and we have to do something about it," Aria tells Ezra in the "Pretty Little Liars" season 6 teaser.

Caleb believes that Hanna knows just how to end it all and he tells this to Spencer, who, unfortunately, is not all that keen in listening to him, especially after she watched Hanna hold his hand and flirt with him right in front of her.

Nonetheless, Hanna will still be convincing Spencer to help out as she believes she is the only one who can. By the end of the "Pretty Little Liars" season 6 promo, Hanna makes a shocking confession: "I murdered Charlotte."

From the looks of it, this could simply be a ploy so Hanna will get to see the face of their new tormentor. She believes that these mysterious accidents will only end if they give the bad guys what they want. Emily and Spencer, on the other hand, ended up working together to investigate if Mona has something to do with Charlotte's killing.

The synopsis for the upcoming "Pretty Little Liars" season 6 episode also teases that Ali will be paid an unexpected visit. Whoever that person is, it looks like he or she will be someone important in completing the puzzle.

"Pretty Little Liars" season 6 episode 19 "Did You Miss Me?" airs March 8 at 8 p.m. ET on Freeform.