The coming second half of Pretty Little Liars season 4 will possibly be disturbing to some viewers, according to star Sasha Pieterse.

Speaking with TV Guide, Pieterse (who plays Alison) revealed that upcoming episodes of Pretty Little Liars will be rather upsetting, dramatically.

"There are a few key things you see this season that really scar you," she warned. "It's really disturbing the way the night of Ali's disappearance went down."

Pieterse previously revealed that the show would be delving into everything that went on while she was presumed dead by the girls.

Additionally, there will be "a very specific thing that happens that's scary," in the Pretty Little Liars season 4 finale, but it will also be a perfect way to end the season, according to TV Guide.

Thus far into season 4B, there has already been a big development with one of the girls: Hanna (Ashley Benson) broke up with Caleb (Tyler Blackburn). Pretty Little Liars show runner I. Marlene King spoke with The Huffington Post about the development and teased some hope for fans of "Haleb."

Pretty Little Liars Spoilers: Girls Mad at Alison After Revealing Herself to be Alive? 

"Hanna is the love of Caleb's life. He says it out loud in Ravenswood." King explained. "He'll continue to say it out loud often and everything he does, even if it's a heartbreaker, is always to protect her. For me, there's so much story to be told here. I get a lot of slack online from the Hanna-Caleb fans, and I love Caleb. So, that's what I can say in terms of giving hope to how this all might ultimately turn out."

Pretty Little Liars season 4 airs Tuesdays at 8 p.m. on ABC Family.

Watch a trailer for the next episode of Pretty Little Liars here:

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