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

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.

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

The girls talk to Alison and try to get her out of jail after uncovering Mike’s connection to Mona. Meanwhile, Spencer travels to London for a college interview; and Alison turns to someone unexpected for assistance with her murder trial.

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

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

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

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

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

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

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

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.

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

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

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

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

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

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

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

The girls look out for Alison’s safety after she is spooked by a recent Rosewood “accident.”

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

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

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

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

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

After years of questions and mystery surrounding the night Alison DiLaurentis disappeared, her four best friends come face to face with Ali and finally learn what really happened to her that September night. Now with their newfound knowledge of Ali’s long-held secrets, can Aria, Emily, Hanna and Spencer help Alison finally figure out who “A” is?

It is a rough time for all of the Liars as Spencer is reeling about the memories from her lost summer, Aria is still nursing a broken heart, Emily is reeling from Paige’s Betrayal and Hanna unsuccessfully attempts to wade back into the dating pool. But as each girl tries to deal with her individual issues, they must focus their attention on their suspicions surrounding Mrs. DiLaurentis. Assuming that Mrs. D knows more about Ali and the night she went missing, girls decide to help out at her charity bridal fashion show to gain access to the DiLaurentis house to search for answers. Meanwhile, Ella and Jason return to Rosewood, each with something to hide.

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. Hanna, on the other hand, begins a new search after being confronted by Det. Holbrook and Lt. Tanner with a possible new lead in Alison’s case.Meanwhile, Spencer and Aria lean on new men in their lives to recover.

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 what to trust, Aria goes looking for answers, not wanting to believe this revelation to be true. While concerned for Aria, Spencer 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. But 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.

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 their friend. A wrench is thrown into the plan when Ezra tells Aria about his concern and suspicion of Spencer’s recent addiction problem. Now with Spencer’s credibility being questioned, can the girls trust what Spencer has been telling them about Ezra — could this all be a figment of Spencer’s tired brain or really just a clever ploy by Ezra to cover his tracks?

Spencer’s numerous sleepless nights with the help of prescription pills start to take a toll on her as her hunt for Ali and much needed answers continues. As she pours over newly acquired information, her world view takes a black and white turn. Now teleported into the world of 1940’s Film Noir, Spencer tries to come up with the answers she and her friends have been desperately looking for. But in this world of fedora hats, switchboards and 15 cent coffee, can Spencer finally put all of the pieces together that lay in front of her?

With Spencer’s possible Board Shorts revelation, she is now more determined than ever to prove her theory before bringing it to the other girls’ attention – especially since it could have a devastating effect on one of the Liars. But with many sleepless nights fueled by prescription medication, Hanna starts to notice Spencer’s odd behavior. Will Detective Hanna be able to figure out Spencer’s secret before Spencer is ready to share? Meanwhile, Emily looks to make amends with Alison through Shana, and all of Aria’s lies start to take a toll on her.

Hanna’s new interest in crime novels helps her to come up with a plan to try and figure out whose body is in Ali’s grave. While Hanna is on her hunt, Spencer is working overtime to decipher the stories in Ali’s diary which she hopes will reveal the identity of Ali’s mystery man. But with both girls hot on the trail, will their work lead them straight into “A’s” path? Meanwhile, Aria is upset with the new friend Mike has made and Emily’s dad is concerned about her behavior.

Shana returns to Ravenswood to tell Emily that she has a message from Ali, but can Emily and the girls trust Shana with all that they know about her? And when Shana ups the stakes and says that Ali wants to meet Emily – and only Emily – could it all be part of an “A” plan, or is Emily really Alison’s favorite? With Emily becoming more hopeful by the minute, Spencer is determined to not let her friend get hurt. Meanwhile, Aria and Hanna deal with matters of the heart.

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. But with the diary full of stories that have been coded to cover the truth, each girl must take a turn to figure out which stories are about them. Hopefully when they are through they will find the story that could finally give them answers to who has been going after Ali. But with each story more personal than the last, do Aria, Emily, Hanna and Spencer really want to admit which story is about them? Meanwhile, Spencer is suspicious of her father’s latest interaction with Mrs. DiLaurentis.

Armed with the knowledge that Alison is alive, Aria, Emily, Hanna and Spencer have more questions now than ever before. Trying to put the pieces together Hanna comes up with the idea that if they find out who is really buried in Ali’s grave it may lead to much needed answers. But as the girls search, Emily has trouble dealing with how she feels about Alison being alive.

Aria, Emily, Hanna and Spencer crash the Ravenswood Founders Day Celebration after finding a clue in “A’s” new lair that Ali may indeed be alive. Dressed in their finest Edwardian wear, the ladies hit the creepy cemetery party to find Ali before “A” can. But if Ali is truly alive, could the PLLs be leading “A” straight to their friend without knowing it? With Ezra lurking in the shadows, “A” may be closer than the girls realize. Meanwhile, Caleb heads to Ravenswood to help the girls and meets kindred soul Miranda along the way.

An intriguing riddle from “A” has the Liars hitting the road and heading to Ravenswood, where they are surrounded by some familiar faces. During a very special magic show, one Liar pulls a disappearing act, leaving the other three scrambling to make sure she hasn’t succumbed to “A’s” tricks. But before they can hightail it out of Ravenswood, they make a shocking discovery that proves that everything they thought they knew about “A” and the “A” team might be wrong. With this discovery, the Liars may just have started “World War A”– #WorldWarA. Meanwhile, Hanna and her mother’s joyous reunion is cut short when “A’s” sights are set on a new target. And Toby uncovers some surprising information about Wren.

After uncovering recent evidence that suggest “A” is hiding out closer than they realized, the Liars step up their investigation into their most recent suspect. Hanna continues to crumble due to her newfound infamy as the daughter of a murder suspect. To complicate matters, Hanna is being stalked by fellow student Travis until she learns he is hiding a secret that may change her life. Meanwhile, Toby continues to be manipulated by “A,” dangling insight into his mother’s death. And Ezra tries to reach out to Aria for help in dealing with his recent troubles, right when she becomes more determined to move on with Jake at a Western themed dance that turns into a two-step with “A.