1ra Temporada

Image	Title	Original Airdate	No. in series	No. in season
	Pilot	June 8, 2010	01	1.01
	Four 16-year-old girls believe their secrets are safe forever after their friendmysteriously vanishes. But the truth may be only one text away.
	The Jenna Thing	June 15, 2010	02	1.02
	With the return of Jenna Marshall to Rosewood, the girls must face an unpleasant past as questions arise about Alison's death.
	To Kill a Mocking Girl	June 22, 2010	03	1.03
	Old and new relationships are examined as the girls try to pay tribute toAlison's memory. But with "A" taunting them every step of the way, can the girls leave the past behind?
	Can You Hear Me Now?	June 29, 2010	04	1.04
	The girls take matters into their own hands and try to put a stop to "A," but the girls' problems are far from over.
	Reality Bites Me	July 6, 2010	05	1.05
	Trying to ignore "A" backfired for the girls and now they must pay the penalty. Meanwhile, the girls must also deal with typical teenage drama—the boy kind.
	There's No Place Like Homecoming	July 13, 2010	06	1.06
	The homecoming dance is supposed to be a time for fun and making memories, but for four pretty little liars, disturbing secrets threaten to ruin their perfect night.
	The Homecoming Hangover	July 20, 2010	07	1.07
	After the homecoming dance, the girls try to sort out the devastation. Plus, "A" isn't the only one sending Aria texts.
	Please, Do Talk About Me When I'm Gone	July 27, 2010	08	1.08
	Last-minute preparations for Alison's memorial get derailed when her brother, Jason DiLaurentis arrives back in Rosewood.
	The Perfect Storm	August 3, 2010	09	1.09
	The girls are trapped at school as a bad storm brews, and tensions run high. Plus, Byron leans on Ashley for advice on parenting as his relationship withElla takes a bad turn.
	Keep Your Friends Close	August 10, 2010	10	1.10
	The girls go "glamping" as A's threats escalate and the FBI arrives in Rosewood. But not even a mani/pedi can lift the girls' spirits when the evening takes a dangerous turn.

1B

Image	Title	Original Airdate	No. in series	No. in season
	Moments Later	January 3, 2011	11	1.11
	Moments after Hanna is hit by a car, the girls' world is turned upside down. Meanwhile, the mysterious messages from "A" continue.
	Salt Meets Wound	January 10, 2011	12	1.12
	As the girls try their best to support Hanna as she returns from the hospital, everyone has their own "surprises" to deal with. Plus, Aria and Ezra suspect someone is on to them.
	Know Your Frenemies	January 17, 2011	13	1.13
	Aria and Ezra feel as if there may be no way out, Emily deals with opposition to her love life and "A" has Hanna jumping through old hoops. The girls get a little unexpected help.
	Careful What U Wish 4	January 24, 2011	14	1.14
	The school dance-a-thon might give the girls more than sore feet. Plus,Aria's old babysitter, Simone, comes to visit, and sets her sights on Ezra.
	If At First You Don't Succeed, Lie, Lie Again	January 31, 2011	15	1.15
	Emily deals with a jealous teammate. Aria and Ezra plan their first date out in the open. Spencer turns to Ali's brother, Jason, for information.
	Je Suis une Amie	February 7, 2011	16	1.16
	At a crucial swim meet for the Rosewood Sharks, Emily and Paige are pitted against each other. Plus, Caleb calls in his favor with a guilty Hanna.
	The New Normal	February 14, 2011	17	1.17
	It's parent-teacher conferences and one little liar's father sits face to face with the love of her life. Better believe that "A" has something to say about it.
	The Badass Seed	February 21, 2011	18	1.18
	As tensions rise, the girls ponder the true nature of evil. Plus, Aria views the school play as an opportunity to get closer to Ezra, but will her plan backfire?
	A Person of Interest	February 28, 2011	19	1.19
	After a shocking revelation from the police, it looks like the four little liars could be crying wolf. With everything pointing to Ian, could the girls be wrong?
	Someone to Watch Over Me	March 7, 2011	20	1.20
	As the heat is turned up on suspicions surrounding Spencer, the girls must come to the harsh realization that they aren't the only ones hiding secrets inRosewood.
	Monsters in the End	March 14, 2011	21	1.21
	Everyone has something to hide. For Aria, Emily, Hanna and Spencer, keeping things hidden is second nature, but having to live with those secrets can become a big burden.
	For Whom the Bell Tolls	March 21, 2011	22	1.22
	The girls go to an unlikely source for help to put an end to "A" and the mystery surrounding their friend. Can they really stop "A" once and for all?