Credit: Richard Foreman/ABC Family Channel © 2010 Disney ABC Television Group Photo: Pretty Little Liars Halloween Episode: Creepy Costume

Trick-or-treat, little liars! It’s time to get all dolled up in your spookiest costume, because the Pretty Little Liars Halloween Special is just days away!

As we know, Alison (Sasha Pieterse) is in the spotlight during this episode, and she’s sharing it with a creepy stalker in a baby costume who may or may not be the mysterious “A.” That’s right, “A” was giving the girls trouble even before Ali died.

"It's that costume that everyone wears, so you're not sure who's in it,” Sasha Pieterse tells Zap2it. “It's going to keep you guessing as to who's in the costume."

As for the spooky antics, Sasha guarantees that this will be a scary episode.

"It puts it on another level and you see that 'A' is definitely not messing around,” Sasha says. Creepy!

This episode is going to be even more delicious than a bag of candy!

Source: Zap2it