<P> Pretty Little Liars is a TV series which premiered on ABC Family on June 8, 2010 . Developed by I. Marlene King, the series is based on the Pretty Little Liars book series by Sara Shepard . The series follows the lives of four girls, Aria Montgomery, Hanna Marin, Emily Fields, and Spencer Hastings, whose clique falls apart after the disappearance of their leader, Alison DiLaurentis . One year later, the estranged friends are reunited as they begin receiving messages from a mysterious figure named "A" who threatens to expose their deepest secrets, including ones they thought only Alison knew . </P> <P> After an initial order of 10 episodes, ABC Family ordered an additional 12 episodes for season one on June 28, 2010 . The first season's "summer finale" aired on August 10, 2010, with the remaining 12 episodes began airing on January 3, 2011 . On January 11, 2011, ABC Family picked up Pretty Little Liars for a second season of 24 episodes . It began airing on Tuesday, June 14, 2011 . It was announced in June that a special Halloween - themed episode would air as part of ABC Family's 13 Nights of Halloween line - up . This increased the episode count from 24 to 25 . On November 29, 2011, ABC Family renewed the series for a third season, consisting of 24 episodes . On October 4, 2012, ABC Family renewed the series for a fourth season, consisting of 24 episodes . On March 26, 2013, ABC Family renewed the series for a fifth season . On January 7, 2014, showrunner I. Marlene King wrote on Twitter that season 5 will have 25 episodes, including a holiday - themed episode . On June 10, 2014, it was announced that the show was renewed for an additional 2 seasons . Season 6 will air in mid-2015, and season 7 will air in mid-2016 . It was announced by I. Marlene King that the sixth and the seventh season will consist of 20 episodes each . It was announced on August 29, 2016, that the show would be ending after the seventh season, and that the second half of the season would begin airing April 18, 2017 . </P> <P> During the course of the series, 160 episodes of Pretty Little Liars aired over seven seasons . </P>

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