<Tr> <Td> </Td> <Td_colspan="1"> 6 </Td> <Td_colspan="2"> 20 </Td> <Td_colspan="1"> June 2, 2015 (2015 - 06 - 02) </Td> <Td> March 15, 2016 (2016 - 03 - 15) </Td> <Td> 1.72 </Td> <Td> 0.8 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 7 </Td> <Td_colspan="2"> 20 </Td> <Td_colspan="1"> June 21, 2016 (2016 - 06 - 21) </Td> <Td> June 27, 2017 (2017 - 06 - 27) </Td> <Td> 1.11 </Td> <Td> 0.6 </Td> </Tr> <Table> <Tr> <Th> No . overall </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> <Th> U.S. viewers (million) </Th> </Tr> <Tr> <Th> </Th> <Td> </Td> <Td> "Pilot" </Td> <Td> Lesli Linka Glatter </Td> <Td> I. Marlene King </Td> <Td> June 8, 2010 (2010 - 06 - 08) </Td> <Td> 2.47 </Td> </Tr> <Tr> <Th> </Th> <Td> </Td> <Td> "The Jenna Thing" </Td> <Td> Liz Friedlander </Td> <Td> I. Marlene King </Td> <Td> June 15, 2010 (2010 - 06 - 15) </Td> <Td> 2.48 </Td> </Tr> <Tr> <Th> </Th> <Td> </Td> <Td> "To Kill a Mocking Girl" </Td> <Td> Elodie Keene </Td> <Td> Oliver Goldstick </Td> <Td> June 22, 2010 (2010 - 06 - 22) </Td> <Td> 2.74 </Td> </Tr> <Tr> <Th> </Th> <Td> </Td> <Td> "Can You Hear Me Now?" </Td> <Td> Norman Buckley </Td> <Td> Joseph Dougherty </Td> <Td> June 29, 2010 (2010 - 06 - 29) </Td> <Td> 2.09 </Td> </Tr> <Tr> <Th> 5 </Th> <Td> 5 </Td> <Td> "Reality Bites Me" </Td> <Td> Wendey Stanzler </Td> <Td> Bryan M. Holdman </Td> <Td> July 6, 2010 (2010 - 07 - 06) </Td> <Td> 2.62 </Td> </Tr> <Tr> <Th> 6 </Th> <Td> 6 </Td> <Td> "There's No Place Like Homecoming" </Td> <Td> Norman Buckley </Td> <Td> Maya Goldsmith </Td> <Td> July 13, 2010 (2010 - 07 - 13) </Td> <Td> 2.69 </Td> </Tr> <Tr> <Th> 7 </Th> <Td> 7 </Td> <Td> "The Homecoming Hangover" </Td> <Td> Chris Grismer </Td> <Td> Tamar Laddy </Td> <Td> July 20, 2010 (2010 - 07 - 20) </Td> <Td> 2.55 </Td> </Tr> <Tr> <Th> 8 </Th> <Td> 8 </Td> <Td> "Please, Do Talk About Me When I'm Gone" </Td> <Td> Arlene Sanford </Td> <Td> Joseph Dougherty </Td> <Td> July 27, 2010 (2010 - 07 - 27) </Td> <Td> 2.52 </Td> </Tr> <Tr> <Th> 9 </Th> <Td> 9 </Td> <Td> "The Perfect Storm" </Td> <Td> Jamie Babbit </Td> <Td> Oliver Goldstick </Td> <Td> August 3, 2010 (2010 - 08 - 03) </Td> <Td> 2.55 </Td> </Tr> <Tr> <Th> 10 </Th> <Td> 10 </Td> <Td> "Keep Your Friends Close" </Td> <Td> Ron Lagomarsino </Td> <Td> I. Marlene King </Td> <Td> August 10, 2010 (2010 - 08 - 10) </Td> <Td> 3.07 </Td> </Tr> <Tr> <Th> 11 </Th> <Td> 11 </Td> <Td> "Moments Later" </Td> <Td> Norman Buckley </Td> <Td> Joseph Dougherty </Td> <Td> January 3, 2011 (2011 - 01 - 03) </Td> <Td> 4.20 </Td> </Tr> <Tr> <Th> 12 </Th> <Td> 12 </Td> <Td> "Salt Meets Wound" </Td> <Td> Norman Buckley </Td> <Td> Oliver Goldstick </Td> <Td> January 10, 2011 (2011 - 01 - 10) </Td> <Td> 3.21 </Td> </Tr> <Tr> <Th> 13 </Th> <Td> 13 </Td> <Td> "Know Your Frenemies" </Td> <Td> Ron Lagomarsino </Td> <Td> I. Marlene King </Td> <Td> January 17, 2011 (2011 - 01 - 17) </Td> <Td> 2.99 </Td> </Tr> <Tr> <Th> 14 </Th> <Td> 14 </Td> <Td> "Careful What U Wish 4" </Td> <Td> Norman Buckley </Td> <Td> Tamar Laddy </Td> <Td> January 24, 2011 (2011 - 01 - 24) </Td> <Td> 3.17 </Td> </Tr> <Tr> <Th> 15 </Th> <Td> 15 </Td> <Td> "If at First You Don't Succeed, Lie, Lie Again" </Td> <Td> Ron Lagomarsino </Td> <Td> Maya Goldsmith </Td> <Td> January 31, 2011 (2011 - 01 - 31) </Td> <Td> 3.19 </Td> </Tr> <Tr> <Th> 16 </Th> <Td> 16 </Td> <Td> "Je Suis Une Amie" </Td> <Td> Chris Grismer </Td> <Td> Bryan M. Holdman </Td> <Td> February 7, 2011 (2011 - 02 - 07) </Td> <Td> 3.14 </Td> </Tr> <Tr> <Th> 17 </Th> <Td> 17 </Td> <Td> "The New Normal" </Td> <Td> Michael Grossman </Td> <Td> Joseph Dougherty </Td> <Td> February 14, 2011 (2011 - 02 - 14) </Td> <Td> 2.35 </Td> </Tr> <Tr> <Th> 18 </Th> <Td> 18 </Td> <Td> "The Badass Seed" </Td> <Td> Paul Lazarus </Td> <Td> Oliver Goldstick & Francesca Rollins </Td> <Td> February 21, 2011 (2011 - 02 - 21) </Td> <Td> 2.90 </Td> </Tr> <Tr> <Th> 19 </Th> <Td> 19 </Td> <Td> "A Person of Interest" </Td> <Td> Ron Lagomarsino </Td> <Td> I. Marlene King & Jonell Lennon </Td> <Td> February 28, 2011 (2011 - 02 - 28) </Td> <Td> 2.69 </Td> </Tr> <Tr> <Th> 20 </Th> <Td> 20 </Td> <Td> "Someone to Watch Over Me" </Td> <Td> Arlene Sanford </Td> <Td> Joseph Dougherty </Td> <Td> March 7, 2011 (2011 - 03 - 07) </Td> <Td> 2.95 </Td> </Tr> <Tr> <Th> 21 </Th> <Td> 21 </Td> <Td> "Monsters in the End" </Td> <Td> Chris Grismer </Td> <Td> Oliver Goldstick </Td> <Td> March 14, 2011 (2011 - 03 - 14) </Td> <Td> 2.94 </Td> </Tr> <Tr> <Th> 22 </Th> <Td> 22 </Td> <Td> "For Whom the Bell Tolls" </Td> <Td> Lesli Linka Glatter </Td> <Td> I. Marlene King </Td> <Td> March 21, 2011 (2011 - 03 - 21) </Td> <Td> 3.64 </Td> </Tr> </Table> <Tr> <Th> No . overall </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> <Th> U.S. viewers (million) </Th> </Tr>

When does episode 20 of pretty little liars air