The television show Pretty Little Liars premiered on ABC Family, marking the beginning of the popular teen drama series.
Season 1 of Pretty Little Liars concluded, wrapping up the initial story arc and setting up further mysteries for the series.
ABC Family renewed Pretty Little Liars for a second season following the success of the first season.
Season 2 of Pretty Little Liars premiered, continuing the storyline and adding new mysteries and characters.
Announcement of the spin-off series 'Ravenswood' based on the Pretty Little Liars universe.
The final episode of Pretty Little Liars aired, concluding the series after seven seasons.
Alison DiLaurentis goes missing in Rosewood, sparking the main mystery of the series.
The remaining girls - Aria, Hanna, Spencer, and Emily - start receiving threatening messages from someone calling themselves 'A'.
Alison's body is found, confirming her death and escalating the tension and stakes among the girls.
Mona Vanderwaal is revealed as the original 'A' tormenting the girls.
Cece Drake is revealed as 'A', the new antagonist behind the scenes.
There is a five-year time jump after the main characters graduate high school.
Alex Drake, Spencer's twin, is revealed as 'A.D.', the mastermind behind the final threats.
