Season 1
01. "The Pilot"
original air date: June 8, 2010
Friends Aria Montgomery, Emily Fields, Hanna Marin, and Spencer Hastings grow apart when their clique leader Alison DiLaurentis goes missing. A year later they all begin receiving messages from the mysterious "A", who threatens to reveal their darkest secrets. They soon suspect that Alison is "A", until her body is finally found and the messages continue.
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02. "The Jenna Thing"
original air date: June 15, 2010
With Jenna's return to Rosewood, the girls are forced to face an unpleasant incident from their past that sealed their friendship forever, especially since "A" won't let them forget it. Meanwhile, questions about the night of Alison's disappearance begin to arise, as the events of that fateful night continue to haunt Aria, Spencer, Emily and Hanna.
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03. "To Kill a Mocking Girl"
original air date: June 22, 2010
The girls try to pay tribute to Alison's memory, but they are still faced with unresolved issues. Aria has an unpleasant encounter with her father's former mistress, and Spencer must face a vengeful Melissa. Hanna is trying desperately to get her boyfriend to forget the 'old Hanna'. But with "A" taunting them every step of the way, the girls will find that leaving the past behind is much harder than they first thought.
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04. "Can You Hear Me Now?"
original air date: June 29, 2010
The girls block e-mails and text messages from all unknown users in an attempt to stop "A," but their problems are far from over. One girl receives a surprise visit, while another receives a gift from a prospective paramour. And just when things couldn't get any more complicated, the girls find out that trying to keep "A" away comes with a price.
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05. "Reality Bites Me"
original air date: July 6, 2010
Aria forgets her cellphone in Mr. Fitz's apartment, and after he reads a message from A, he decides to break up with her rather than risk being fired. Hanna has to work in a dentist office to pay for the damage she did to Sean's car and gets some damaging information from A about one of her friends. Emily hides her budding friendship with Toby due to the girls' suspicion about him, hurting his feelings. Spencer's father tells her to throw a tennis match against a possible client and his daughter, and Ella deals with her husband's cheating.
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06. "There's No Place Like Homecoming"
original air date: July 13, 2010
When Emily decides to bring Toby as her homecoming date she soon finds herself in a possibly sticky situation with Toby and Maya, and at the same time, Aria is broken over her hidden-relationship with Ezra. Meanwhile, the girls must face a heartbreak, a boyfriend's virginity and some disturbing information that involves Toby and Jenna's relationship.
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07. "The Homecoming Hangover"
original air date: July 20, 2010
Aria's brother, Mike, doesn't take it very well that his parents are separating, which makes him fight in school after his mother decides to not watch his game. Emily decides to give a shot on dating Maya. Hanna and Sean make-up, but she's more interested in Lucas. Spencer and Alex have some fun in the country's club kitchen. At last, A has still one more creepy message to deliver to the girls, which makes them assume that Toby might be dead. Sara Shepard, writer of the Pretty Little Liars book series, makes a special appearance in the episode as a substitute teacher at Rosewood High School.
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08. "Please Do Talk About Me When I'm Gone"
original air date: July 27, 2010
As new evidences about the day that Alison died comes to the surface, Spencer gets some damaging information from Alison's brother, Jason. Aria agrees to go out on a double date with Hanna and Sean's friend Noel, and the evening takes an interesting road once Aria realizes that Noel is way more than just a pretty face. Emily and Maya’s relationship blossoms when Emily asks Maya on a date. Due to the Marins' financial problems, Hanna's credit card gets declined, so she decides to put a lot of her old clothes and handbags up for auction online with the help of new ally Lucas. Meanwhile, the girls begin to prepare themselves for Alison's memorial day, but once they find out that Jenna will be the one to deliver a speech about Alison, they all get scared. Later that night, a mystery person comes out and destroys Alison's memorial.
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09. "The Perfect Storm"
original air date: August 3, 2010
A terrible storm comes to Rosewood, and all of the students are trapped in school. Emily reveals a secret after she's accused of killing Alison. When Aria is about to give Noel a chance on dating her, Ezra returns. Byron leans on Ashley for advice as his relationship with Ella only gets worse. Meanwhile, Spencer discovers something that her mother has been keeping from her. And at the end of the episode, Lucas tries to tell something to Hanna, and his shoes are dirty, suggesting that he was at Alison's memorial.
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10. "Keep Your Friends Close"
original air date: August 10, 2010
When new evidence leads the FBI to believe that Toby killed Alison, he tries to tell Emily his side of the story yet rats him out. Spencer tries to mend fences with sister Melissa, just as her ex-boyfriend Ian returns. Aria begins to develop feelings for Noel, which complicates her relationship with Ezra even more, until Ezra admits his feelings for her and they kiss once again with Hanna watching as she kept post to find out who "A" is. Ashley's financial problems are bringing her to the brink. Meanwhile, the girls go "glamping" for Mona's birthday in hopes of closing in on "A", but when "A"'s identity is revealed to Hanna, "A" runs her over before she gets a chance to tell the others.
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11. "Moments Later"
original air date: January 3, 2011
Hanna is now in the hospital and remembers who A is. She tells the girls it was Noel Khan because she saw him write 'I see you' on the back on Ezra's car while Aria and Ezra were kissing. But the girls are starting to question if the person who killed Alison and who A is are two different people. Meanwhile Melissa and Ian eloped and Emily tells her parents she is gay. Also Lucas admits his feelings for Hannah, but is heartbroken when she tells him she only likes him as a friend. The girls find out that 'A' wrote on Hanna's plaster "sorry".
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12. "Salt Meets Wound"
original air date: January 10, 2011
Hanna mends in a wheelchair upon her release from the hospital. Meanwhile, Aria is struggling to tell Ezra that Noel knows about their relationship; Spencer's romance with Alex hits a snag and Emily invites Maya to dine with her family; Surprises haunt the Liars as "A" continues the game.
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13. "Know Your Frenemies"
original air date: January 17, 2011
"A" makes Hanna eat cupcakes, making her think about being bulimic again. "A" saves Aria's and Ezra's relationship. Emily's mom finds drugs in Maya's bag, and brings the bag to Maya's parents, thus sending her to juvie. Spencer unravels the Ali murder, thinking Ian is the killer. She also finds out that her sister, Melissa, is trying to get pregnant. In the end, a video of Ali and Ian is shown, the camera falls, leaving the watchers hearing someone choking someone. A body is thrown to the ground, Ali's hand appearing in front of the screen. Her initial Ali bracelet brings the girls to think Ian killed Ali.
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14. "Careful What U Wish 4"
original air date: January 24, 2011
As the school gets ready for the dance-a-thon, Aria, Emily, Hanna and Spencer have more on their minds than raising money for the school trip to Washington, DC. Hanna is having a hard time finding a job to help her family's financial situation, but when "A" has a job for her, will Hanna be able to refuse? Emily can only think of Maya and is desperate to speak to her -- so much so that she enlists the help of Caleb, the new bad boy in the school. And as an important piece of property goes missing, Spencer finds being in close quarters with her new brother-in-law, Ian, more difficult than ever. Meanwhile, Aria's former babysitter, Simone, comes back to town for a surprise visit. But what should be a happy reunion quickly becomes a nightmare for Aria when Simone sets her sights on Ezra.
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15. "If At First You Don't Succeed, Lie, Lie Again"
original air date: January 31, 2011
The girls try to resume a sense of normalcy in their lives, but even the simple tasks of dating and extra-curricular activities meet with strife. Emily must deal with a jealous teammate (Lindsey Shaw) who is threatened by Emily’s return to the pool, as Aria and Ezra plan their first date out in the open. And Hanna is still stuck playing “A’s” game, but the next hurdle might just have complications for another Liar. With “A” pulling the strings and making matters worse, will the girls be able to weather the storm and lie their way out of it, or will they have to face the ugly truths? Meanwhile, Spencer turns to Ali’s brother, Jason, for information about the night they believe Alison died, only to have to face part of her unpleasant past with Ali.
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16. "Je Suis Une Amie (I Am a Friend)"
original air date: February 7, 2011
A crucial swim meet for the Rosewood Sharks is the setting for Aria, Emily, Hanna and Spencer to experience a lot of turmoil. Emily and Paige go for round two, as they are pitted against each other to compete for the anchor leg of the big race. And Caleb calls in his favor with a guilty Hanna as she tries to deter Aria from asking too many questions about Ella’s ticket to the museum opening. Meanwhile, Spencer takes on the task of tutoring Toby in French to try and get some answers.
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17. "The New Normal"
original air date: February 14, 2011
Aria's dad has a parent-teacher interview with Ezra. Meanwhile Toby and Spencer start to get closer. And Spencer and the girls realized what the note means. Hanna's mom gets in trouble when Mrs. Potter's nephew tries to access Mrs. Potter's safety deposit.
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18. "The Badass Seed"
original air date: February 21, 2011
The girls are doing a play together; while done rehearsing, they find a trophy with blood on it, making them think its Alison's blood... but it turns out to be rat's blood; they all get memories about when they crashed a frat party; Aria uses the play to get closer to Mr. Fitz; Hanna and Caleb turn into a couple; the police come after the girls at the end with some questions.
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19. "A Person of Interest"
original air date: February 28, 2011
After a shocking revelation from the police, the spotlight is turned on the four little liars who look to be crying wolf. But with everything pointing to Ian, how could the girls be wrong? Or could this be just another game "A" is playing with them? With the cops now demanding answers from Aria, Emily, Hanna and Spencer, will the girls come clean about "A," or are some secrets better left buried? The police take a special interest in Spencer, who accuses Ian of murder. The truth surrounding what happened in Hilton Head is revealed. Meanwhile, secret relationships take a toll on some of the Liars while others blossom. Love is not for the faint of heart. At the end of the episode Toby and Spencer kiss. When she gets home the cops are there, the secret is revealed that her and Ian were hooking up.
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20. "Someone to Watch Over Me"
original air date: March 7, 2011
As the heat is turned up on the suspicions surrounding Spencer, the girls must come to the reality that they aren't the only ones hiding secrets in Rosewood. Spencer remembers something that happened the night of the murder. Caleb is a spy, he is working for Jenna. The girls over hear Caleb talking to a girl on the phone, they try and warn Hanna the only problem is, will it be too late?
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