ARIA, EMILY, HANNA AND SPENCER'S FUN GETS DERAILED IN A SPECIAL HALLOWEEN EPISODE OF "PRETTY LITTLE LIARS," AIRING TUESDAY, OCTOBER 23RD AT 8:00 PM ET/PT ON ABC FAMILY

Adam Lambert Makes A Guest Appearance and Performs

All Day Pretty Little Liars Marathon to Air 7:00 AM - 8:00 PM ET/PT

Burbank, CA (Sept. 11, 2012) - The Rosewood Halloween Ghost Train is the perfect setting for all of "A's" tricks and treats, in "This Is a Dark Ride," a special Halloween-themed episode of ABC Family's hit original series "Pretty Little Liars," airing Tuesday, October 23rd (8:00 - 9:00 PM ET/PT), as part of ABC Family's "13 Nights of Halloween" programming event. Musical guest star Adam Lambert ("American Idol") performs his songs "Trespassing" and "Cuckoo," from his latest album "Trespassing," during the Halloween festivities.

Aria, Emily, Hanna and Spencer are looking forward to some good old 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 trick or treats. With "A" running amuck and unexpected party-goers popping up at every turn, this Halloween event becomes one killer party.

"Pretty Little Liars" is produced by Alloy Entertainment in association with Warner Horizon Television and is executive produced by I. Marlene King, Oliver Goldstick and Leslie Morgenstein. The series stars Troian Bellisario, Ashley Benson, Tyler Blackburn, Holly Marie Combs, Lucy Hale, Ian Harding, Laura Leighton, Chad Lowe, Shay Mitchell, Janel Parrish and Sasha Pieterse.

Part of the Disney/ABC Television Group, ABC Family is distributed in over 97 million homes. ABC Family features programming reflecting today's families, entertaining and connecting with adults through relatable programming about today's relationships - told with a mix of diversity, passion, humor and heart. ABC Family's programming is a combination of network defining original series and original movies, quality acquired series and blockbuster theatricals. Emmy(R) Award-winning ABCFamily.com provides a variety of interactive entertainment and community features, from rich, fan-centric programming - including blogs, viewing parties, webisodes, full episodes of the network's hit programming, along with sneak peek exclusive previews and behind-the-scenes clips. ABC Family is also the destination for annual Holiday events with "13 Nights of Halloween" and "25 Days of Christmas." ABC Family. A New Kind of Family.