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.

After Hanna’s shocking abduction by “Uber A,” the PLLs and company desperately race against the clock to save one of their own. The only way to do this is by handing over evidence of Charlotte’s real murderer to “Uber A.” In order to do so, the girls must decide what blatant lines they are willing to cross that they have never breached before; and once they cross that line, there is no turning back.

With the fallout of Hanna’s abduction still weighing heavily on the PLLs, the Liars begin to grow suspicious of Elliott Rollins as Ali’s condition worsens. Tensions rise between Liam, Aria and Ezra as they work on the book together. Spencer and Caleb are on edge, as neither of them want to talk about the awkward elephant in the room.

Meanwhile, Emily receives a disturbing phone call and tries to find a way to see Ali.

Still reeling from the trauma of Hanna's abduction and dark fate, the Liars must shift their focus to another one of their own. In order to protect Alison from Uber A's threats, the PLLs snap into action at a chance to rescue her from the hospital. However, in doing so, they make a deadly mistake that changes everything.

The PLLs desperately attempt to cover up their secret, and in turn, end up straining their relationships with their respective bed buddies by keeping them in the dark. While the aftermath of Haleb’s kiss weighs on Spaleb’s relationship, Spencer copes in ways she might later regret. Mona intervenes with the cover-up plan, for better or worse.

Jenna returns to Rosewood and befriends another one of the Liars’ enemies, making her the PLL’s number one suspect for Uber A. In order to leave the psychiatric hospital, Ali must be released into the care of a relative, leaving her under the suspicious watch of Mary Drake. Spencer enlists Hanna’s help to search for Caleb as he’s missing in action. Aria and Emily stumble upon a secret apartment they hope will lead them to more answers.

The Rosewood P.D. begins to unravel the Liars’ cover-up, which leads them to question Rollins’ death altogether. Hanna deals with an inward battle on whether or not to tell the cops the truth, while Ezria struggles with an awkwardness in their relationship. Jenna reveals part of her plot and a new partner she is in cahoots with. Ali learns that the Liars gave her up as Charlotte’s killer in order to free Hanna, which does not go over well. Meanwhile, someone is murdered for playing with the wrong team.

Jason returns to town to stop Ali from getting too close to Mary. The girls learn something new about Mary and Mrs. DiLaurentis that leads them to a storm cellar full of clues. Ezra gets a call about someone in his past that could change his course. Noel Kahn grows more and more suspicious and rises to the top of the list of suspects for Uber A.

Emily goes up for a position as the Rosewood High swim coach, only to learn that her ex-girlfriend Paige is also up for the job. Hanna is visited by Mrs. Grunwald after she has a vision that the PLLs are in danger. The girls track down the doctor who delivered Mary’s baby in order to get answers. Ali decides to go back to work to help bring some normalcy to her life again.

One of the PLLs goes rogue to prove that Noel Kahn is Uber A, while the others try to find evidence to back her theory and worry about her emotional state. Emily unexpectedly turns to Paige for comfort in her time of need, which causes tension in her other relationships. Jason and Aria team up to look into Mary’s past and what she might be hiding.

The Liars face off with their enemies in a chaotic fight that ends fatally. One of the PLLs learns a secret about her past that changes everything while another Liar discovers something about her future that could alter her course forever.

Spencer focuses on learning more about her connection to Mary Drake, while Aria and Ezra figure out what their future may hold now that Nicole is back in the picture. Mona helps Hanna get her fashion career back on track, and Emily struggles to balance things between Ali and Paige now that the three of them are working at Rosewood High. Meanwhile, A.D. has a special delivery for the Liars, one that reveals the final endgame.

Emily butts heads with teenager Addison, who appears to be a new version of high school Ali, and who may be connected to a familiar foe. Spencer confronts her mother about keeping family secrets. Aria confides in Holden about her relationship with Ezra, while Spencer turns to Detective Furey for help. And Jenna stirs up even more trouble when she returns to Rosewood with some insight into Noel Kahn and recent events.

Hanna is sure Jenna is to blame for a recent professional setback and is forced to bring Caleb up to speed on current events. Aria and Emily team up to investigate Sydney for more information about Jenna and her connection to A.D. Spencer grows closer to Detective Furey, while Aria struggles with her current situation with Ezra. Hanna’s turn at the game is more intense than she bargained for and leads to shocking consequences.

Ali’s turn at the game forces her to face a monumental personal decision, made even more difficult when A.D. triggers Ali to remember a forgotten trauma. Spencer has a long overdue conversation with her father about his past sins and recent whereabouts. Emily continues to navigate working at Rosewood High with both Ali and Paige, especially when Ali comes to a troubling realization about her pregnancy, and Paige makes a big decision. Aria continues to question the fate of her relationship with Ezra and bristles under A.D.’s taunts. And, in the search for Mary Drake, Hanna and Spencer run into a familiar face with a shocking secret.

After being blackmailed by A.D., one of the Liars begins to supply info to the dark side in order to protect those closest to her. Detective Furey questions how much the PLLs know about what happened to Archer Dunhill. Aria tries to issue an ultimatum to Ezra in regards to Nicole, while Emily struggles with how to support Ali. Spencer goes to elaborate lengths to meet up with Mary Drake and encounters Wren. After learning something surprising about Lucas, Hanna sets out to prove her friend is innocent and uncovers even more troubling info.

As Detective Furey closes in on uncovering what happened to Archer Dunhill, the Liars team up to protect one of their own. Hanna continues to struggle with the idea that Lucas might be connected to A.D. even in the face of more evidence. Emily surprises Ali with a heartfelt gesture that is undone by A.D. machinations; and the Liars gain insight into where the idea for the game originated.

With Mona making inroads in the game, Emily reluctantly teams up with her to investigate. Ashley returns to Rosewood to check on Hanna after learning some frightening information and asks Caleb what his intentions are with her daughter. Meanwhile, Spencer’s family reels from A.D.’s latest taunt, leaving Spencer more confused than ever about who to trust. Ezra notices Aria’s change in attitude and fears he may have lost her; and A.D.’s machinations cause Aria to have a terrifying nightmare.

The Rosewood PD turn up the heat on the Liars, causing loved ones to try and close ranks. Aria’s recent collaboration with A.D. comes to the attention of a surprising source. A.D. presents the PLLs with a choice designed to drive a wedge between them. Meanwhile, everyone tries to find a bit of happiness before all hell breaks loose. Toby returns to Rosewood, and Aria makes a horrifying discovery.

Convinced they know who A.D. is, the Liars gear up for a confrontation. Spencer, Hanna, and Caleb team up to investigate and discover new information about Charlotte’s death. Meanwhile, Mary Drake returns with a gift for Spencer and Alison.

All is revealed as the ultimate endgame comes to light.