Grave New World

4x13  is the untitled thirteenth episode of Season 4 of Pretty Little Liars. It will air in October 22, 2013 as the season's Halloween episode.

Summary
This October, the unbelievable journey to Ravenswood continues. It's a story so big, it'll take 2 hours to tell. The all new Pretty Little Liars Halloween Special followed by the world premiere of Ravenswood Tuesday October 22nd only on ABC Family.

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
 * 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.