VIDEO: Sneak Peek - Adam Lambert Performs on ABC Family's PRETTY LITTLE LIARS, 10/23

Related: PRETTY LITTLE LIARS, ABC Family

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. Get a sneak peek at Lambert's appearance below!

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.

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