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Freeform series Pretty Little Liars has spurred multiple spin-offs and a highly anticipated reboot, but its O.G. series ruled teen TV for seven years. Five best friends, played by Lucy Hale, Troian Bellisario, Ashley Benson, Shay Mitchell and Sasha Pieterse, fall apart after their clique leader Alison disappears. One year later, the estranged pals start to receive threatening text messages from a mysterious "A," who vows to expose their darkest secrets.
Stream on HBO Max.