Based on the Pretty Little Liars series of young adult novels by Sara Shepard, the series follows the lives of four girls — Spencer, Hanna, Aria, and Emily — whose clique falls apart after the disappearance of their queen bee, Alison. One year later, they begin receiving messages from someone using the name "A" who threatens to expose their secrets — including long-hidden ones they thought only Alison knew.
| Title | Time | |
|---|---|---|
| 1 | Pilot | 2010-06-08 |
| 2 | The Jenna Thing | 2010-06-15 |
| 3 | To Kill a Mocking Girl | 2010-06-22 |
| 4 | Can You Hear Me Now | 2010-06-29 |
| 5 | Reality Bites Me | 2010-07-06 |
| 6 | There's No Place Like Homecoming | 2010-07-13 |
| 7 | The Homecoming Hangover | 2010-07-20 |
| 8 | Please, Do Talk About Me When I'm Gone | 2010-07-27 |
| 9 | The Perfect Storm | 2010-08-03 |
| 10 | Keep Your Friends Close | 2010-08-10 |
| 11 | Moments Later | 2011-01-03 |
| 12 | Salt Meets Wound | 2011-01-10 |
| 13 | Know Your Frenemies | 2011-01-17 |
| 14 | Careful What U Wish 4 | 2011-01-24 |
| 15 | If at First You Don't Succeed, Lie, Lie Again | 2011-01-31 |
| 16 | Je Suis une Amie | 2011-02-07 |
| 17 | The New Normal | 2011-02-14 |
| 18 | The Badass Seed | 2011-02-21 |
| 19 | A Person of Interest | 2011-02-28 |
| 20 | Someone to Watch Over Me | 2011-03-07 |
| 21 | Monsters in the End | 2011-03-14 |
| 22 | For Whom the Bell Tolls | 2011-03-21 |
