The seventh season has nine roles receiving star billing, with eight of them returning from the previous season, six of which was part of the original cast from the first season. The season saw the four protagonists of the series continue the roles as they try to take down the new 'A'. Troian Bellisario played Spencer Hastings, who has relationship problems with Caleb, while Ashley Benson played Hanna Marin, who was kidnapped at the end of last season. Lucy Hale continued her role as Aria Montgomery as she is set in a love triangle with Ezra and her boyfriend Liam. Shay Mitchell portrayed Emily Fields who begins to rekindle her relationship with Alison. Sasha Pieterse continued to portray Alison DiLaurentis as Alison struggles with being in a psych-ward. Janel Parrish returned as Mona Vanderwaal who seems to be finally on their side. Tyler Blackburn continues to play Caleb Rivers and Ian Harding also continued his role as Ezra Fitz. Andrea Parker was added as a series regular, playing Jessica DiLaurentis' twin sister Mary Drake.
