Grave New World

Grave New World is the thirteenth episode of Season 4 of Pretty Little Liars. It will air on October 22, 2013 as the season's Halloween episode.

Summary
Aria, Emily, Hanna and Spencer crash the Ravenswood Founders Day Celebration after finding a clue in "A's" new lair: Ali is alive. Dressed in their finest Edwardian wear, the ladies hit the creepy cemetery party to find Ali before "A" can. But if Ali is truly alive, could the liars be leading "A" straight to their friend without knowing it? With Ezra lurking in the shadows, he may be closer than the girls realize.

Meanwhile, Caleb heads to Ravenswood to help the girls and meets kindred soul Miranda along the way.

Title and Background

 * If the girls find out that Ali is really alive, their whole world will be changed. This will be the girls' first step into their new lives with the knowledge of Ali being alive.
 * This title is likely a pun to Aldous Huxley's novel, Brave New World, written in 1932.

Main Cast

 * Troian Bellisario as Spencer Hastings
 * Ashley Benson as Hanna Marin
 * Shay Mitchell as Emily Fields
 * Lucy Hale as Aria Montgomery
 * Janel Parrish as Mona Vanderwaal
 * Sasha Pieterse as Alison DiLaurentis

Guest Cast

 * Tyler Blackburn as Caleb Rivers
 * Ian Harding as Ezra Fitz
 * Keegan Allen as Toby Cavanaugh
 * Meg Foster as Carla Grunwald

Special Guest Cast
Ravenswood Characters
 * Nicole Anderson as Miranda Collins
 * Brett Dier as Luke Matheson
 * Britne Oldford as Remy Beaumont

Trivia

 * This will be the third Halloween episode, the first being The First Secret and the second being, This Is A Dark Ride.
 * Filming began on May 29, 2013 and ended on June 10, 2013 since filming "usually takes 7 days".
 * This episode (4x13) was filmed between The Guilty Girl's Handbook (4x08) and Into the Deep (4x09) for unknown reasons.
 * The episode was screened at the Hollywood Forever Cemetery on October 15, 2013.