Madison 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.

When Allison and Ariel find an innocent mother and daughter dead in a pool of blood Allison struggles with finding out how she is connected to the crime and worries the gruesome scene has scarred Ariel.

Allison's latest visions reveal an odd new friendship between two ghosts, and surprisingly one of the men rebuffs her attempts to determine the identity of his killer.

Unsure what to make of her dream, Allison soon realizes that she is trapped reliving the same day and discovers that it is up to her to find a way to stop a hostage situation before it explodes.