The prequel episode of the hit show kicks off ABC Family's 13 Days of Halloween and puts Sasha Pieterse into the spotlight. Sasha plays dead girl Allison who is very much alive in this special episode.
Sasha dropped by our studio recently where we tried to get her to spill some juicy details about the episode.
"This is the first time you see Allison alone, it's first time you see her bedroom, it's the first encounter with her enemies, it's the first secret between her and the girls and then there's this really big secret that I'm not allowed to tell anyone," Sasha teased us.
She also told us that "there is a lot revealed" in this prequel. "It's a different side of Allison," she continued, "and it kinda gears us up for the next half of our season."
We can't wait! Check out more of our interview to find out what role Sasha initially auditioned for and what it was like when she found out they were doing a prequel around her character.
For even more Sasha, take a look at "Good and Bad with Sasha Pieterse." "Pretty Little Liars" airs tonight on ABC Family at 8pm EST.