Trick or treat! Pretty Little Liars returns from its break with a Halloween special tonight, and they're flashing back to the year before Ali first disappeared in the episode titled "The First Secret." Since it's Halloween, we get to see all the girls dressed up in costume, which range from the sexy to the historical (and of course, there's the return of Hanna's infamous fat suit). Check out the sneak peek of the episode to see all the costumes!



