: This indicates the source of the video was a High-Definition television broadcast (in this case, the ABC Family network).
This episode is famous for introducing the of the show. The studio filled with life-cast masks shifted the tone from a standard teen drama to a psychological thriller. It also set the stage for the introduction of "Red Coat" and the eventual "A" reveal.
The episode first aired on , and centers on the Liars digging into the past of Ali’s mysterious masks. 🎭 The Central Plot: The Mask of Ali
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