The self-professed "glampire" will share a scene with Lucy Hale's character Aria. He tells ET, "I don't suck blood her or anything. I'm friendly. I'm Adam Lambert dressed as a vampire. I'm not an actual vampire."
Without letting the tightly-kept secret plotline slip, Lucy, dressed as Daisy Buchanan from The Great Gatsby, reveals the episode "reminds [her] of the game Clue." She says, "Last Halloween episode, it was a pretty big deal, but they are pulling out all the stops for this one. They're building things and we took over a whole new stage because usually we have two stages, but this is a new stage and they're building a train because the party takes place on a train and things start to happen on this train."