Grave New World

Grave New World is the thirteenth episode of Season 4 of Pretty Little Liars. It will air in 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 that Ali may indeed be 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 PLLs be leading "A" straight to their friend without knowing it? With Ezra lurking in the shadows, "A" may be closer than the girls realize.

Meanwhile, Caleb heads to Ravenswood to help the girls and meets kindred soul Miranda (Nicole Gale Anderson) along the way.

Title and Background

 * The previous title was "Let the Maid Go."

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
 * Tammin Sursok as Jenna Marshall
 * Meg Foster as Carla Grunwald

Special Guest Cast
Ravenswood Characters
 * Nicole Anderson as Miranda
 * Bret Dier  as Luke
 * Merritt Patterson as Olivia
 * Britne Oldford as Remy

Trivia

 * This will be the third Halloween episode, the first being The First Secret and the second being, This Is A Dark Ride.
 * Joseph tweeted Halloween, with I. Marlene King and Oliver Goldstick, when asked about what he writing next.
 * Joseph tweeted that they were getting this episode ready (May 26).
 * The table-read was on May 28, 2013.
 * Late night shoot was on June 4, 2013.
 * Ashley tweeted that they had another late night shoot on June 5, 2013.
 * Filming began on May 29, 2013 and ended on Monday, 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 promo for this episode was leaked on August 23, 2013.