Who's In The Box?

Who's In The Box? is the fourteenth episode and the winter premiere of Season 4 of Pretty Little Liars. It will air on January 7, 2014.

Title and Background

 * With Ali being alive now confirmed, it is assumed that the "box" is a coffin, and this episode could deal with who was buried in Ali's coffin. This has been confirmed by Marlene.

Spoilers for 4B
The following notes are all spoilers/hints that have been revealed so far, concerning the second half of Season 4.
 * According to Marlene, Aria is A's target in 4B
 * Sasha will be in many upcoming episodes (source)
 * Brenda, an academic overachiever, wants to help a scholastic pressured Spencer by giving her, her secret - but for a hefty price. Her secret? Let's say that Emily won't be the only one popping pills. Source

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

 * Lindsey Shaw as Paige McCullers
 * Ian Harding as Ezra Fitz
 * Keegan Allen as Toby Cavanaugh
 * Laura Leighton as Ashley Marin
 * Tyler Blackburn as Caleb Rivers
 * Andrea Parker as Jessica DiLaurentis
 * Nolan North as Peter Hastings
 * Larisa Oleynik as Maggie Cutler

Trivia

 * The table read was on July 16, 2013.
 * Filming began on July 17, 2013, and ended on July 25, 2013.