No. overall No. in season Title Directed by Written by Original air date U.S. viewers (million) "Pilot '' Lesli Linka Glatter I. Marlene King June 8, 2010 (2010 - 06 - 08) 2.47 "The Jenna Thing '' Liz Friedlander I. Marlene King June 15, 2010 (2010 - 06 - 15) 2.48 "To Kill a Mocking Girl '' Elodie Keene Oliver Goldstick June 22, 2010 (2010 - 06 - 22) 2.74 "Can You Hear Me Now? '' Norman Buckley Joseph Dougherty June 29, 2010 (2010 - 06 - 29) 2.09 5 5 "Reality Bites Me '' Wendey Stanzler Bryan M. Holdman July 6, 2010 (2010 - 07 - 06) 2.62 6 6 "There 's No Place Like Homecoming '' Norman Buckley Maya Goldsmith July 13, 2010 (2010 - 07 - 13) 2.69 7 7 "The Homecoming Hangover '' Chris Grismer Tamar Laddy July 20, 2010 (2010 - 07 - 20) 2.55 8 8 "Please, Do Talk About Me When I 'm Gone '' Arlene Sanford Joseph Dougherty July 27, 2010 (2010 - 07 - 27) 2.52 9 9 "The Perfect Storm '' Jamie Babbit Oliver Goldstick August 3, 2010 (2010 - 08 - 03) 2.55 10 10 "Keep Your Friends Close '' Ron Lagomarsino I. Marlene King August 10, 2010 (2010 - 08 - 10) 3.07 11 11 "Moments Later '' Norman Buckley Joseph Dougherty January 3, 2011 (2011 - 01 - 03) 4.20 12 12 "Salt Meets Wound '' Norman Buckley Oliver Goldstick January 10, 2011 (2011 - 01 - 10) 3.21 13 13 "Know Your Frenemies '' Ron Lagomarsino I. Marlene King January 17, 2011 (2011 - 01 - 17) 2.99 14 14 "Careful What U Wish 4 '' Norman Buckley Tamar Laddy January 24, 2011 (2011 - 01 - 24) 3.17 15 15 "If at First You Do n't Succeed, Lie, Lie Again '' Ron Lagomarsino Maya Goldsmith January 31, 2011 (2011 - 01 - 31) 3.19 16 16 "Je Suis Une Amie '' Chris Grismer Bryan M. Holdman February 7, 2011 (2011 - 02 - 07) 3.14 17 17 "The New Normal '' Michael Grossman Joseph Dougherty February 14, 2011 (2011 - 02 - 14) 2.35 18 18 "The Badass Seed '' Paul Lazarus Oliver Goldstick & Francesca Rollins February 21, 2011 (2011 - 02 - 21) 2.90 19 19 "A Person of Interest '' Ron Lagomarsino I. Marlene King & Jonell Lennon February 28, 2011 (2011 - 02 - 28) 2.69 20 20 "Someone to Watch Over Me '' Arlene Sanford Joseph Dougherty March 7, 2011 (2011 - 03 - 07) 2.95 21 21 "Monsters in the End '' Chris Grismer Oliver Goldstick March 14, 2011 (2011 - 03 - 14) 2.94 22 22 "For Whom the Bell Tolls '' Lesli Linka Glatter I. Marlene King March 21, 2011 (2011 - 03 - 21) 3.64
when does episode 20 of pretty little liars air
March 7, 2011