Approaching the second anniversary of Alison's disappearance, a shocking event rocks Rosewood.

One of Aria's past indiscretions is fodder for a new "A." and Emily recalls a crucial event from the night she lost her memory.

Spencer asks questions, but stumbles upon a larger secret, while Aria agrees to be Jenna's accompanist.

Visiting Mona is driving a wedge between Hanna and Caleb and Hanna is forced to weigh up how honest to be with him.

Jenna throws a party to die for and the Liars are suspicious when Garrett is let out of prison to visit his mother.

A new clue could lead the girls down the wrong path. Emily remembers something new from the other night but the recollection suggests a very surprising suspect.

Hanna is worried that Detective Bryce is trying to frame her and the others turn to a very unlikely person for help.

Spencer asks Caleb for help. Aria learns about Ezra's past. Emily is worried about how Paige will be affected by everything "A" has done to her.

After Spencer turns in desperation to Cece for help with her college application, she and Aria may find some answers at the Kahn brothers' party.

A cabin may hold the key to Maya's secrets so Hanna and Emily do some snooping.

Paige's past comes back to haunt Emily. Aria gets a surprise from Ezra's past.

As the town becomes a media circus in the run-up to the new trial, the girls are betrayed by someone close to them.

Unexpected Halloween party guests pop up at every turn and The Rosewood Halloween Ghost Train becomes one killer party.

To the girls' dismay, Mona is headed back to Rosewood High. Aria, Emily, Hanna and Spencer take very different views of the "new" Mona.

A battle of the brains stresses Spencer, Aria learns of reasons to suspect her father of foul play, Hanna confronts Lucas, and Emily gets a fright in the woods.

Ailing Aria has reason to be afraid, while Spencer’s romantic gesture results in an unpleasant surprise.

Distracted Spencer’s anger is let-loose on Ezra, hurting Aria. Emily and Hanna each end up at the police station.

Emily’s memories get muddled in therapy, Caleb’s boyhood things intrigue Hanna, Ezra’s brother brings trouble, and Spencer gets bitter.

Spencer’s misbehaviour causes concern, Hanna engineers an encounter Caleb is resisting, Emily’s detective work turns dangerous.

Det. Wilden seeks to silence those who know his secret, the heat is on for Spencer after reengaging with Wren, and Ezra’s mother tries a new angle of attack.

Death stalks someone close to Spencer, while Hanna has evidence to ditch, and Aria finds baby-sitting awkward.

Spencer’s mental state deteriorates while her friends fret. A reappearance proves miraculous and ominous.

Some secrets of Mona’s asylum stay come to light, a corpse must be faced, and a lost child tracked down.

A turncoat’s betrayal is nothing compared to the deadly trap the liars are lured into hoping to see the face of their nemesis.

The girls are reunited when they each begin receiving threatening messages from someone named "A," suggesting Alison is actually alive - and watching them.

The presence of Mrs DiLaurentis continues to unnerve those around her, especially when she gives Hanna a parrot, whose gift for mimicry provides an insight into Alison's last days.

Hanna worries that her mother is keeping a dangerous secret and is determined to protect her at all costs, which leads to an uncomfortable meeting with Detective Holbrook.

Holbrook's partner, Lt Tanner, comes to town, intensifying their investigation into the Liars and their possible connection to Wilden's death.

Spencer and Emily make plans to visit a nearby college, but they have very different agendas for their time spent on campus.

Hanna's attempt to protect her mother gets her into hot water. Hanna has some explaining to do to her parents and the police after she's found with something she shouldn't have.

Caleb and Toby team up to investigate "A" and what really happened the night of the lodge fire and encounter a source that points to a new possible identity for "Red Coat".

Hanna comes up with a plan to save her mother from a conviction and turns to the only person she thinks can help: Mona. Caleb tries to convince Hanna that Mona can't be trusted.

Paige throws Emily a surprise birthday party with even more surprising guests - Jenna and Shana. But it's the actions of "A" at the party that lead to the biggest shock of all.

Still living at a motel, Emily is taken aback when Ali's mother offers to let her move into Ali's old room and is shocked when the other Liars insist Emily take up the offer.

After uncovering evidence that suggests "A" is hiding out closer than realised, the Liars step up their investigation into their most recent suspect. Hanna continues to crumble.

An intriguing riddle from "A" has the Liars hitting the road and heading to Ravenswood, where they are surrounded by some familiar faces.

Aria, Emily, Hanna and Spencer crash the Ravenswood Founders Day Celebration after a clue in "A"'s new lair suggests that Ali may indeed be alive.

Armed with the knowledge that Alison is alive, Aria, Emily, Hanna and Spencer now have more questions than ever before.

Now that Hanna has shared with Aria, Emily and Spencer that she has Ali's diary, the girls hope it can shed light on their many questions.

Shana tells Emily that she has a message from Ali, but can Emily and the girls trust Shana? Shana ups the stakes and says that Ali wants to meet Emily, but only Emily.

Hanna's interest in crime novels helps her to come up with a plan to figure out whose body is in Ali's grave. Spencer is working overtime to decipher the stories in Ali's diary.

With Spencer's possible revelation about Board Shorts, she is now more determined than ever to prove her theory before bringing it to the other girls' attention.

This special black-and-white episode gives a nod to 1940s-era film noir as Spencer's numerous sleepless nights with the help of prescription pills start to take a toll on her.

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

The Liars are concerned for Aria as they watch her crumble after learning shocking news about Ezra. Not knowing what is true or who to trust, Aria goes looking for answers.

Emily takes up the sleuthing reins as she searches for answers about Ezra and Mona. After confronting both, Emily tries to make sense of the heartbreaking situation.

Spencer is reeling about the memories from her 'lost summer', Aria is nursing a broken heart, Emily struggles with Paige's betrayal and Hanna attempts to get back into dating.

After years of questions and mystery surrounding the night Alison DiLaurentis disappeared, The Liars finally learn what really happened to her that September night.

Aria watches over Ezra at the hospital, while Alison and the others set a trap for "A."

Emily, Spencer and Hanna try to adjust to the new normal; Kenneth searches for Jessica.

Alison struggles with the death of her mother, as the Liars try to navigate through her new lie.

Alison attempts to regain her position as leader of the gang upon her return to Rosewood High.

Alison returns to Rosewood High and attempts to repair the damage she inflicted years earlier.

The girls look out for Alison's safety after she is spooked by a recent Rosewood "accident.''

Aria searches for information on a patient; Spencer borrows Ezra's spy equipment.

Hanna is pushed down a dark path after Alison moves in; Aria fails in her duties as maid of honor.

Hanna's drinking gets out of control; Emily looks for information linking Alison to Noel.

The Liars try to prevent Alison from sending an innocent man to jail; Hanna seeks a normal life.

Melissa reveals her knowledge of Alison's disappearance to Spencer; Emily seeks Ezra's help.

Aria, Emily, Hanna and Spencer feel trapped and search desperately for a way out of a bad situation.

A Halloween-themed ode to viewers features interviews with cast and crew, fan questions and visits from dearly departed characters.

The girls are not feeling merry at Christmas because Spencer's murder charge looms over them. Things improve though after they see an opportunity to gather evidence to clear her name.

The Liars try to prove that Alison was involved in Mona's death; Aria worries about her future.

Spencer and Toby are at odds while Emily and Aria struggle with situations that are out of their control.

Secrets abound for Aria, Hanna and Spencer while Emily tries to let go of Paige.

Hanna refuses to let "A" frame her for Mona's murder; Spencer's actions put Toby in a bind.

Mona's friend comes to town to pay her respects.

Aria hopes Andrew can be her tutor; Spencer helps Jonny with a new project.

Hanna enters a beauty contest and turns to Emily for help; Aria asks Andrew to keep an eye on Mike.

The girls scramble for evidence as Alison considers a deal. Spencer has a night out on the town in London.

Ali considers a plea deal, but it incriminates someone else, so the girls try to help her and Mike, as well as themselves. Elsewhere, Spencer unwinds while on a night out in London

Testimony at Alison's trial reveals a plethora of lies; Spencer, Aria, Emily, and Caleb follow a string of clues in hope of uncovering information that will clear Hanna.

The prosecution calls a surprise witness in Alison's trial; the girls hunt for last-minute evidence.

Shocking secrets come to light for Aria, Emily, Hanna and Spencer as the biggest clue to the "A" mystery is revealed.

Moments after where the season five finale left off, Aria, Emily, Hanna, Spencer and Mona are trapped outside of Charles’ Dollhouse with nowhere to go and must now deal with an angry tormentor. Just when the Liars thought Charles couldn’t get any worse, his games take a more demented and darker turn. As the girls struggle to survive, the puzzle of Charles’ story begins to come together.

Meanwhile, Ezra, Caleb and Toby continue the fight to find the girls with or without Rosewood P.D.’s help.

The girls may have gotten out of the Dollhouse but what happened to them during their time of captivity has lasting effects. With worried loved ones watching over them, the PLLs are home and trying to heal, with not much success. Even with suspected tormentor Andrew in custody, Aria, Emily, Hanna and Spencer fear they are far from safe.

Meanwhile, Alison must deal with her past indiscretions and her notoriety around Rosewood.

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. Aria focuses on Andrew by trying to figure out who this boy really is while Emily tries to connect with a new friend. In true Spencer fashion, she is on a mission to get answers about Charles from Ali and Jason. Hanna wants to bring the four friends back together so they can move past what happened in the Dollhouse.

Meanwhile, Alison is no longer the queen bee/mean girl she once was – but who is she now? A new friend tries to help her find the courage to start anew and find the “new” Alison.

After lying to Alison and Jason about Charles, Kenneth comes clean about the family’s connection to the young boy. While he won’t give much detail about Charles’ past, he say’s enough to give the PLLs a clue of where to look for the missing pieces – Radley Sanitarium. With Radley now closed and the files shipped off to be shredded, the girls must act fast before all traces of Charles’ past disappear.

Meanwhile, Caleb’s protective nature starts to pinch Hanna, and Spencer seeks a remedy for her sleeping issues.

Mona returns to Rosewood in a very fragile state as she must answer to the police for faking her death. Matters only get worse when she is confronted by Lesli’s sister about Lesli’s inadvertent involvement in Mona’s plot. Hanna is determined to help Mona out, not only to reassure her she is safe from Alison but also to try and repair Mona’s friendship with Lesli. Emily tries to help Sara with her troubled home life by encouraging her to explore the possibility of emancipation. Spencer, on the other hand, finds help from someone from her past.

Meanwhile, Alison grows closer to Lorenzo as she looks for support outside of her family.

With all signs pointing to Lesli as the tormentor in the hoodie, the PLLs are on a mission to get concrete proof before bringing their findings to the police. But as the girls ramp up their investigation, "A’s" threats escalate.

Meanwhile, a friend of Emily’s makes her a surprising offer, and Spencer is pressured by her family to make an important decision.

There are mixed emotions in the DiLaurentis household when Charles declares he is coming home for his birthday. Mr. DiLaurentis wants to quickly get out of town to hide Ali and Jason from their brother, while Jason sees this as an opportunity to finally validate all of the early childhood memories he has of “Charlie.” The PLLs are just as split with Spencer and Hanna seeing this as the best chance they have to capture Charles, while Emily and Aria want to stay as far from him as possible. Will Jason be reunited with his brother, or is this just another of “A’s” traps?

Meanwhile, Mona is shutting Mike out and Hanna gets an unwelcomed surprise.

After their latest run-in with Charles, tensions are at an all-time high with the PLLs and the town of Rosewood. Aria’s big moment of seeing her work displayed in an art gallery is in jeopardy as Ella is determined to keep her safe at home. Hanna is still uncomfortable with the unexpected scholarship money and is determined to give it back, even if that means ruining her chances at going to her school of choice. And to top it off, the one normal high-school rite of passage the girls are looking forward to is in danger as Rosewood High is considering not letting the PLLs attend prom due to security issues.

Meanwhile, the more Alison learns about her brother the harder she finds it to connect a deranged murderer to the young blonde haired boy she sees in the photos and in her memories.

It is prom time at Rosewood High School, except for Alison, Aria, Emily, Hanna and Spencer who have been banned due to "security" concerns. As the girls see this as the final humiliating blow to their high school careers, the girls' mothers try to make the best of a bad situation by offering a home prom in Spencer's barn. At first reluctant, the PLLs agree and try to make the best out of a bad situation. But one to never miss a formal, Charles has other plans in store to make this a night they will never forget.

Meanwhile, Veronica, Pam, Ashley and Ella use prom night to touch base on everything that has happened to their daughters.

Who killed Toby's mother? Who hit Alison in the head with the rock the night she went missing? Who is Red Coat? Who killed Bethany? Who is the Black Widow? Why has "A" been targeting the PLLs all this time? After years of torture, Alison, Aria, Emily, Hanna and Spencer finally come face-to-face with their tormentor and learn the story of how and why Charles became "A."

After years of tormenting and numerous shocking revelations, Torn between their old habits and their new lives, the events in Rosewood compel the Liars to join forces once again, as relationships are put to the test and secrets are revealed. Having matured over the past few years, these are not the same girls who left Rosewood. As new lies emerge – how will they push forward without going back?

As the girls are forced to stay in Rosewood, questions about the new mystery surface. A restless Aria starts to look suspicious as she heads back to Boston a little too quickly. But could Aria really be the one behind this? As Spencer, Emily and Hanna find themselves back in familiar territory, they aren't happy with going about solving this puzzle "the old way."

Meanwhile, Emily continues to lie about her life in California and Alison keeps a close eye on her friends.

Aria, Emily, Hanna and Spencer find themselves back in familiar territory with the Rosewood P.D. knocking at their doors looking for answers and their actions now affecting the loved ones around them. With her mother's job on the line, Hanna tries to come up with an alibi that could save all four of them with the help of her old high school friend, Lucas.

Meanwhile, Emily comes clean about the last five years, and Aria goes the extra mile to keep Ezra's second book in play with her boss.

With the Rosewood P.D. breathing down Hanna's neck about The Radley security footage, she opts to confess the truth to those closest to her in hopes they can help. Aria continues to search for answers, with help from Emily, on whether Ezra is as guilty as he seems. Spencer works together with Caleb to track down the new threat.

Meanwhile, there is awkwardness all around when new love interests emerge and old ones resurface.

In order to prove Sara Harvey is behind the threats, Team Sparia reunites to find evidence of Sara's involvement before they go to the cops. Caleb puts together a plan with Hanna to fight back against the new stalker by using the security footage tapes.

Meanwhile, Aria gets unexpected news from her family, and Ali comforts Emily in her time of need.

While new discoveries are made in the investigation of Charlotte's murder, the truth begins to emerge about the Liars' personal lives. Spencer is concerned to learn her mother is keeping a secret of her own. Aria confesses to Liam how deeply she's involved with Ezra's book. Ali admits that she and Elliott are more than just friends. Mona reveals where her true allegiances lie. Caleb, Spencer and Hanna deal with the complications of new relationships.

Meanwhile, Emily and Hanna each receive shocking threats that elevate the seriousness of the situation.

As romantic relationships move forward, the Liars investigate a new suspect in the murder case. With Ezra back in Rosewood, Aria must tell him the truth about her involvement with his book. Spencer and Caleb deal with a media leak that affects the campaign. Hanna takes a look at her life after an incident at work. Emily gets harassed by the stalker while she continues the search for Sara.

Meanwhile, two lovers finally tie the knot with the help of a special officiant.

After the stalker nearly killed Emily, the Liars begin to take the threats more seriously and attempt to keep their mouths shut to prevent any further harm. Caleb must deal with the collateral damage of taking the blame for the leak about Yvonne; Spencer tries to comfort him and get him to tell the truth. Emily goes on a mission to track down who came after her. Aria and Ezra move forward with the novel.

Meanwhile, Hanna avoids dealing with her personal life.

After Alison is confronted with a sudden, mysterious jeopardy, the Liars decide to take things into their own hands for a counterattack. Hanna and Caleb work together to develop a plan to come face-to-face with the tormentor. Emily and Spencer team up to investigate if Mona had any involvement with the murder. Aria and Ezra continue to work on the book though it might be more difficult than anticipated.

Meanwhile, Ali encounters an unexpected visitor.

With the stalker threatening to kill all of them if they don’t divulge Charlotte’s killer by the election, the PLLs and company, at wit’s end, must boldly fight back. As Spencer and Toby work together to catch Sara Harvey, Yvonne wonders where Toby’s true affections lie. Ezra finishes the last chapter of his book, finally ready to say goodbye to Nicole; Aria comforts him during this emotional time and old feelings bubble to the surface. While Caleb works intently on his plan to protect Hanna, they reflect on what could have been.

Meanwhile, Alison experiences strange visions and starts to question her sanity; Emily keeps tabs on her to make sure she’s okay.