Miranda Carabello

The streets of Rosewood are festive, little kids are running around the streets hoping for a good year of trick or treats, and five best friends are looking forward to the biggest party of the season. It is the Halloween before Alison went missing and the only concern for Aria, Emily, Hanna and Spencer is to score an invite to Noel Khan's (recurring guest star BRANT DAUGHERTY - Super Sportlets, Private) Halloween party. But with a new girl in town to challenge Ali for Queen Bee dominance, the possibility of Spencer losing the election for class president - along with her parents' approval - and a shocking revelation for Aria about her father, there may be more to worry about this Halloween than finding the perfect costume. With all of the tricks and treats floating around Rosewood, there may be something more sinister waiting out there for Ali and her best friends.

In this special Halloween episode, Aria, Emily, Hanna and Spencer are looking forward to some good Halloween fun now that the traumatic events with Nate are behind them. But once aboard the Rosewood Ghost Train, the girls are in for much more than just some childish tricks or treats. With "A" running a muck and unexpected party-goers popping up at every turn, this Halloween event becomes one killer party. Plus, musical guest star Adam Lambert (American Idol) performs his songs "Trespassing" and "Cuckoo" during the Halloween festivities.

Allison has visions that contradict the findings of an FBI profiler helping on a potential serial-killer case, causing him to question the source of her information.

Allison's long-standing nemesis, defense attorney Larry Watt, decides to use her powers to his advantage by hiring her as a consultant. Unfortunately, Allison's dreams tell her that his client is guilty of killing his wife.

Allison struggles to see the connection between several recent "accidental" deaths after experiencing visions of Scanlon and girlfriend Lynn DiNovi's friend dying in a home mishap and a scary trip to the hospital herself. Meanwhile, Joe must find a cheap, inventive answer to Marie's need for glasses after she tricks the optometrist.