Aria has an unsettling encounter with Meredith; Emily is forced to see Toby in a new light; Spencer is reeling in the wake of a vengeful Melissa.

The liars take matters into their own hands and try to put a stop to "A" by blocking all unknown users, but their problems are far from over.

Trying to ignore "A" backfired for the liars and now they must pay the penalty as they deal with typical teenage drama - the boy kind.

The homecoming dance is supposed to be a time for fun and making memories, but for the liars, disturbing secrets threaten to ruin their perfect night.

After the homecoming dance, the liars try to sort out the devastation; "A" isn't the only one sending Aria texts as tensions rise in the Montgomery household..

The liars go glamping for Mona's birthday 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.

As the liars try their best to support Hanna's release from the hospital, they each have their own surprises to deal with.

As Noel steps up his pursuit of Ezra, him and Aria start to feel like there may be no way out; Pam's perceived tolerance of Maya comes to a screeching halt; Spencer must handle the return of happy newlyweds Melissa and Ian; "A" has Hanna jumping through old habit hoops with regard to the stolen money.

Emily and Paige are pitted against each other in the big race; Caleb calls in his favor with a guilty Hanna; Spencer takes on the task of tutoring a fellow student to get answers.

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.

As tensions rise, the girls ponder the true nature of evil; Aria views the school play as an opportunity to get closer to Ezra, but will her plan backfire?

After a shocking revelation from the police, it looks like the liars could be crying wolf. With everything pointing to Ian, could the girls be wrong?

As the heat is turned up on suspicions surrounding Spencer, the liars must come to the harsh realization that they aren't the only ones hiding secrets in Rosewood.

Everyone has something to hide, but having to live with those secrets can become a big burden for the liars; Spencer and Toby aren't able to be seen together; Rosewood police officer Garrett keeps his promise to keep a close eye on the girls - much closer than they realize.

In the season one finale, 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?

The liars face the fallout from what happened with Ian at the church, their parents have them talk with a therapist; Caleb returns to see Hanna; Spencer is told Toby is off-limits.

Emily struggles with her family's impending move to Texas; Spencer tries to be supportive of Toby's new plans; Ezra's begs Aria to work things out, but is there anything left to say?

The liars try to keep their distance from each other; Spencer notches up her suspicions about what is going on in the DiLaurentis house, with Jason moving back in.

On the eve of the Rosewood Charity Fashion Show, the liars are surprised with Jessica DiLaurentis' return to town and her request that they participate in the show on Alison's behalf; Spencer quickly learns that Mona has stepped in and taken charge of running the event.

The girls are uneasy as each confronts complicated matters. Ezra and Jason are invited to a dinner party at the Montgomerys and vie for Aria's attention.

Aria tries to process Spencer and Emily's news about Jason while dealing with her feelings for him; Hanna tries to be nice to her future stepsister Kate; 'A' turns up the heat on Emily by trying to push her to breaking point.

The liars finally reveal the torment "A" has put them through to the one person they trust outside their group, Dr. Anne Sullivan, but could she be next on "A's" target list?

All is not what it seems as "A" sends the girls on a hunt to destroy lives. Can the liars go through with their given tasks in order to save one, or will they ignore "A" to save those around them from being hurt?

It's the Halloween before Alison went missing and the friends hope to score an invite to Noel's Halloween party; Jenna challenges Ali for Queen Bee dominance; Aria learns a shocking revelation about Byron.

A month has passed since the liars were arrested and they're at each others' throats and Emily has been iced out completely. But what could have divided them so severely, has "A" finally won the game of divide and conquer?

The liars, realizing that "A" is not acting alone and their helper may be closer than they think, decide to enlist Caleb's hacking skills.

Toby continues to pursue Spencer, knowing that she is keeping something from him; Hanna begs the other girls to stop using Caleb to help with their search; Aria is desperate to save her relationship with Ezra.

The liars are on the quest for answers of what Alison knew before she died; Jason drops off a bag of Alison's personal items that could be more than just a bag of junk; Toby's return to Rosewood brings a surprise reunion that ends dangerously.

The hunt for answers about what Ali knew leads Aria, Emily, Hanna and Spencer to a rundown doll hospital that holds more than just secrets.

The girls go to the hotel Ali checked in before she disappeared. Spencer discovers Mona's secret. Dr Sullivan comes back to Rosewood.

As the second anniversary of Alison's disappearance nears, Aria, Emily, Hanna and Spencer are thrown back into turmoil after a shocking night.

One of Aria's past indiscretions is fodder for a new "A." A still-shaky Emily tries to focus on school, but could be derailed when she remembers a crucial piece from "that night."

Aria, Emily, Hanna and Spencer think Jenna's birthday party could be the perfect setting for "A" to strike - and for them to catch their tormentor.

A new clue could lead the girls down the wrong path. Emily gets another flashback from "that night," leading to a surprising suspect, and Aria questions Ezra's new influx of cash.

With new key evidence in Alison's murder case, Hanna fears that "A" may be framing her after a visit from Det. Wilden; Aria decides that she has to turn to Mona for answers; Someone from Ali and Jason's past arrives in Rosewood..

Trying to explain the drugged flask to Paige leads Emily to more insights about "that night"; Spencer asks Caleb for help; Aria learns about Ezra's past.

Emily is caught in the crossfire as Maya's murderer is revealed; The liars are betrayed by someone close to them.

Trick or treat? The Rosewood Halloween Ghost Train becomes one killer party in this special Halloween-themed episode. Plus, Adam Lambert performs.

Radley Sanitarium gives Mona a clean bill of health, and she heads back to Rosewood High, much to the liars' dismay.

Aria, Emily, Hanna and Spencer are sure that Mona is up to her old tricks again, but can they prove it? Meanwhile, Aria's fears about her father grow stronger.

Meredith helps take care of Aria when she is sick - but could she have ulterior motives?; Spencer surprises Toby for their anniversary.

Will their secrets drive the girls to take desperate actions that could make things worse? Plus, Emily learns more about what Ali may have been hiding the summer before her murder.

In the third season finale, the girls attempt to put an end to the game. With so much happening and new information uncovered, will the girls be ready for what is waiting for them?

The PLLs work with Mona to try and get some clarity on A.

The presence of Mrs. DiLaurentis continues to unnerve all those around her; Toby shares a heartbreaking secret with Spencer; "A" nearly kills Mona.

Hanna worries her mother is keeping a dangerous secret, which leads to an uncomfortable meeting with Detective Holbrook; Melissa returns to Rosewood.

A new detective means new questions, and the liars are asked some hard questions; Spencer lays a trap for Melissa.

Trying to protect her mom gets Hanna in trouble with the cops; Searching for the recipient of Ali's mysterious phone number leads Spencer and Toby to Ravenswood.

Caleb and Toby team up to investigate "A" and what happened the night of the lodge fire; Ezra struggles with how he fits into Aria's life; Hanna tries to act normal.

Mrs. DiLaurentis offers to let Emily move into Ali's old room; Trying to get involved in Jake's interests; Aria finds an opportunity to follow a lead.

Ezra reaches out to Aria, just as she decides to move on with Jake; A Western-themed dance turns into a two-step with "A"; Hanna is stalked by a fellow student.

An intriguing riddle from "A" has the liars hitting the road and heading to Ravenswood, where they make a shocking discovery.

Now it's confirmed that Alison is alive, who was buried in Ali's coffin?

After Hanna reveals that she has Ali's diary, the liars hope it can answer some questions, but are they ready to admit which personal story is about them?

Shana says that Ali wants to meet Emily - and not the other girls - but could it all be part of an "A" plan?; Aria and Hanna deal with matters of the heart.

Spencer's numerous sleepless nights, with the help of prescription pills, take a toll on her as her hunt for Ali and much needed answers continues, teleporting her into the world of 1940s film noir.

Spencer is determined that it is finally time to tell Aria about what she has found out about Ezra, but Emily and Hanna are worried about what it could do to her.

Emily, Hanna and Spencer are concerned for Aria as they watch their friend crumble after learning shocking news about Ezra. Not knowing what is true or who to trust, Aria goes looking for answers, not wanting to believe this revelation to be true. Spencer is concerned for Aria, but she is not doing so well herself. Trying to prove to her parents and Toby that she can kick the habit on her own, Spencer has to be careful because one misstep could send her to rehab. Can Spencer really rein it in, or will her constant curiosity and drive be her undoing? Meanwhile, Paige has had enough with Emily's secrets and is determined to stop it.

The liars try to wrap their head around the new normal; Jason's odd behavior and Kenneth's search for Jessica starts to raise eyebrows.

Ali returns to Rosewood High and hopes to help heal the damage she did years ago, but not if Mona and her army have anything to say about it; Caleb and an old foe return to Rosewood.

As Hanna's downward spiral continues, an unfortunate incident with Zack threatens to strain her friendship with Aria. Spencer and Emily dig deeper into Bethany's relationship with Mrs. Dilaurentis.

Emily is on the hunt to find out the truth about Alison, seeking unlikely help from Ezra Fitz for information about Cyrus and Alison's connection. Meanwhile Melissa's secret is finally revealed, Hanna asks for Spencer's and Toby's help with Caleb and his drinking problem.

The girls join forces with Mona to figure out why Ali reached out to the police. Alison's actions put Spencer in the cross-hairs of Bethany's murder investigation. Mona reveals the truth about Ali, resulting in an aching loss.

It is Christmas time and all of the liars are planning on having a great time at the Ice ball, but 'A' has other plans.

The liars get trapped in an abandoned house with A on their trails they struggle to get out. Meanwhile Toby, Spencer, and Caleb try to find out who killed Mona.

Now that Alison is in jail, the 4 liars are A's victims. The liars are now scared more than ever.

A search for Mona's laptop is underway, and it may lead to Spencer and Caleb to break Toby's rules. Meanwhile, Aria gets sidetracked when she's about to come clean to Ezra; and Hanna and tries to keep her mom's secret when Pastor Ted returns.

The liars are breaking the law. They need to look in the barrel and find out what's inside. But the cops are on their tail and they're getting ready to arrest. What will be in the tank?

The liars desperately want to know why Mike gave their blood samples and why he's visiting Alison in jail; Hanna is worried about her fee and getting admission in dance; Emily still hasn't told Talia about her biggest fear; Spencer is still confused with why Toby's not telling her the truth.

Alison's trial comes to a close when the prosecution calls a surprise witness; The liars race to find someone or something that can prove Ali's innocence; Mike becomes a target of "A" when it looks like he might be called to testify.

'A' has always had fun playing with the liars, but now they have the biggest game to date in store for the girls.

The liars are trapped outside of Charles' dollhouse, where his games grow more sinister; Ezra, Caleb and Toby are determined to locate the liars.

The girls struggle with the lasting after effects of their time spent in the dollhouse.

The girls' lives have been turned upside down by their captivity and each one of them is looking for answers to make sense of their ordeal.

Charles declares he is coming home for his birthday; Mona is shutting Mike out; Hanna gets an unwelcomed surprise.

As the girls attend their senior prom, A's threats escalate and the girls get one step closer to finding out the truth about Charles DiLaurentis.

After five years, the liars return to Rosewood when Alison asks them her to testify for Charlotte's release.

Hanna admits the truth; Aria and Emily look for answers about Ezra; Spencer and Caleb try to track down the new threat; New love interests emerge and old ones resurface.

The liars start taking the threats more seriously; Caleb deals with taking the blame for the leak; Emily tries to track down who attacked her; Aria and Ezra move on with the book.

The stalker threatens to kill the liars if they don't divulge Charlotte's killer by the election; Alison experiences strange visions and starts to question her sanity.

The liars rush to save Hanna after she's abducted by Über A, and the only way is to turn over evidence that will reveal who really murdered Charlotte DiLaurentis.

To save Ali from Über A's threats, the liars snap into action to rescue her, but a deadly mistake is made which changes everything.

The liars made a mistake and now they're trying to hide it, but their romantic relationships will bear the brunt of their actions.

Ali is released into the care of Mary Drake; Spencer and Hanna search for a missing Caleb; Aria and Emily stumble upon a secret apartment.

Jason returns and goes all-out in order to get rid of Mary; The liars learn something new about Mary and Jessica; Ezra gets a call about someone in his past.

The liars face off with their enemies in a chaotic fight that ends fatally; One liar learns a secret about her past; Another discovers something about her future.

With more secrets being uncovered, the liars all have something to deal with; A.D sets a game for the liars.

Aria and Emily team up to investigate Sydney; Spencer grows closer to Detective Furey; Hanna's turn at the game is more intense than she bargained for.

The Rosewood PD turn up the heat on the liars; A.D. presents the liars with a choice designed to drive a wedge between them; Aria makes a horrifying discovery.

Secrets come tumbling out as the ultimate endgame comes to light and A.D. is revealed.

Aria has an unsettling encounter with Meredith; Emily is forced to see Toby in a new light; Spencer is reeling in the wake of a vengeful Melissa.

Emily, Hanna and Spencer are concerned for Aria as they watch their friend crumble after learning shocking news about Ezra. Not knowing what is true or who to trust, Aria goes looking for answers, not wanting to believe this revelation to be true. Spencer is concerned for Aria, but she is not doing so well herself. Trying to prove to her parents and Toby that she can kick the habit on her own, Spencer has to be careful because one misstep could send her to rehab. Can Spencer really rein it in, or will her constant curiosity and drive be her undoing? Meanwhile, Paige has had enough with Emily's secrets and is determined to stop it.

Now that Alison is in jail, the 4 liars are A's victims. The liars are now scared more than ever.

The liars get trapped in an abandoned house with A on their trails they struggle to get out. Meanwhile Toby, Spencer, and Caleb try to find out who killed Mona.

It is Christmas time and all of the liars are planning on having a great time at the Ice ball, but 'A' has other plans.

The girls join forces with Mona to figure out why Ali reached out to the police. Alison's actions put Spencer in the cross-hairs of Bethany's murder investigation. Mona reveals the truth about Ali, resulting in an aching loss.

Emily is on the hunt to find out the truth about Alison, seeking unlikely help from Ezra Fitz for information about Cyrus and Alison's connection. Meanwhile Melissa's secret is finally revealed, Hanna asks for Spencer's and Toby's help with Caleb and his drinking problem.

As Hanna's downward spiral continues, an unfortunate incident with Zack threatens to strain her friendship with Aria. Spencer and Emily dig deeper into Bethany's relationship with Mrs. Dilaurentis.

Ali returns to Rosewood High and hopes to help heal the damage she did years ago, but not if Mona and her army have anything to say about it; Caleb and an old foe return to Rosewood.

The liars try to wrap their head around the new normal; Jason's odd behavior and Kenneth's search for Jessica starts to raise eyebrows.