She's Come Undone

She's Come Undone is the twenty first episode of Season 4 of Pretty Little Liars. It is set to air on February 25, 2014.

Synopsis
The PLLs try to help Aria cope. Paige corners Emily about Ali. Spencer’s family realizes the severity of her addiction. Source

Title and Background

 * It can refer to Aria breaking down after she finds out about Ezra being A, similar to what happened to Spencer in season 3B. It is revealed that Aria will have a restrained scene where there is a lot of screaming and crying. This title may refer to that scene. And based on the mini-synopsis, it's highly likely this is true.
 * It's a coincidence that 4x21 of The Vampire Diaries is the same title as 4x21 of Pretty Little Liars.
 * It may refer to Spencer, since she reveals a secret from the past and may go even further down the dark path.

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

 * Keegan Allen as Toby Cavanaugh
 * Lindsey Shaw as Paige McCullers
 * Lesley Fera as Veronica Hastings
 * Nolan North as Peter Hastings
 * Sean Faris as Gabriel Holbrook
 * Andrea Parker as Jessica DiLaurentis
 * Luke Kleintank as Travis

Trivia

 * Filming began September 26, 2013 and ended on October 5, 2013.