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'Pretty Little Liars' Halloween Special Sneak Peek!

Pretty Little Liars will be returning to TV tonight for a special Halloween prequel episode and star Sasha Pieterse promises it’s a good one!

In a new interview with Entertainment Weekly, Sasha, who plays Alison, said the new episode takes place a year before Alison went missing.

The Halloween episode, titled “The First Secret,” won’t disappoint Pretty Little Lairs fans.

“You’re going to be blown away,” Sasha said.

“There are a lot of first secrets in this episode,” she explained. “It’s a time warp — all the way back to the beginning of the girls’ friendship and the beginning of her first encounters with her enemies.”

And this special episode will lead to “a big revelation… that the girls will soon find out.”

We can’t wait!

Watch the preview clip, below!