2 seasons available (18 episodes)

Pretty Little Liars: Original SinPretty Little Liars: Original Sin

In 1999, a series of tragic events threatened to rip apart a close-knit circle of friends -- and their small blue-collar town of Millwood, Pennsylvania. Twenty years later, a ragtag group of Millwood High students finds themselves hunted by an assailant known only as "A," who threatens to make them pay for their parents' past transgressions -- as well as sins of their own. Created by Roberto Aguirre-Sacasa and Lindsay Calhoon Bring, this dark, horror-tinged coming-of-age drama takes place in the familiar Pretty Little Liars universe, introducing an all-new set of Liars who must unravel decades of generational trauma and Millwood's long-held mysteries if they hope to make it out of high school alive.more

In 1999, a series of tragic events threatened to rip apart a clos...More

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Episode 1

Chapter One: Spirit Week

In 1999, a deadly Y2K rave leaves a group of friends forever changed. Twenty-two years later, the life of pregnant 16-year-old Imogen Adams is rocked by the sudden death of her mother, Davie -- and the fallout of a fight with her former best friend, Karen. Then, as Millwood High's Spirit Week approaches, Imogen and a group of fellow outcasts are targeted by a shared enemy.

Episode 2

Chapter Two: The Spirit Queen

After receiving a series of increasingly disturbing texts, Imogen and her newly-formed friend group -- Tabby, Faran, Noa and Mouse -- plot to end Karen's reign of terror. Later, Imogen finds herself in an unexpected position just in time for the Spirit Week dance, while Karen and her twin sister Kelly hatch a payback plan of their own.

Episode 3

Chapter Three: Aftermath

In the wake of Spirit Week, Imogen unearths long-buried truths on her path to unmask the mysterious "A." After Sheriff Beasley closes in, Noa, Faran and Mouse weigh their options, while Tabby works to recover vital evidence.

Episode 4

Chapter Four: The (Fe)male Gaze

With her mother’s house now on the market, Imogen consults the supernatural for answers. After being forced to spend time with Kelly, Faran notices a string of peculiar coincidences -- and enlists Henry for help testing her hypothesis. While shooting her latest short film, Tabby remembers a harrowing trauma and Noa comes face-to-face with a terrifying foe.

Episode 5

Chapter Five: The Night He Came Home

Unwilling to part with her mother's house, Imogen throws an epic Halloween rager to raise some cash to save it -- and enlists her friends to help. At the party, Faran puts her Kelly theory to the test, while Mouse wades in dark waters tied to a mysterious core wound. Later, Tabby confronts Tyler and Greg for their toxic behavior.

Episode 6

Chapter Six: Scars

After bonding over shared trauma, Imogen and Tabby take a road trip to Rosewood, where they double down on their efforts to uncover the truth about past events. Meanwhile, Noa attempts to help her mom, Mouse goes on her first date and, armed with a tip from "A," Faran works to heal old wounds.

Episode 7

Chapter Seven: Carnival of Souls

As the annual Millwood carnival approaches, a long-held family secret causes increased tension between Mouse and her mom, Elodie. Meanwhile, Imogen forges an unexpected connection during a health class assignment that hits close to home, Tabby hatches a new plan and Faran finally confronts her chronic pain -- and her mother.

Episode 8

Chapter Eight: Bad Blood

The friends attempt to get to the bottom of one mystery, while Imogen pursues answers to another. Then, a much-needed girls' night prompts Sidney to confront her daughter about a long-held secret.

Episode 9

Chapter Nine: Dead and Buried

Despite coming clean to their mothers about "A," the friends find their troubles are far from over. In the search for answers, Imogen turns to her estranged father for help, while Tabby considers an unexpected suspect. Then, Mouse deals with the aftermath of a lie, as Faran attempts to protect Kelly from an increasingly unhinged Sheriff Beasley.

Episode 10

Chapter Ten: Final Girls

With the anniversary of Angela's death approaching, an already vengeful "A" doubles down. As Tabby and Imogen work to confirm a hunch, the members of the group confront their mothers about what really happened on New Year's Eve 1999 -- and how it led to them being tormented by a vengeful masked assailant in the present.

About this Show

Pretty Little Liars: Original Sin

In 1999, a series of tragic events threatened to rip apart a close-knit circle of friends -- and their small blue-collar town of Millwood, Pennsylvania. Twenty years later, a ragtag group of Millwood High students finds themselves hunted by an assailant known only as "A," who threatens to make them pay for their parents' past transgressions -- as well as sins of their own. Created by Roberto Aguirre-Sacasa and Lindsay Calhoon Bring, this dark, horror-tinged coming-of-age drama takes place in the familiar Pretty Little Liars universe, introducing an all-new set of Liars who must unravel decades of generational trauma and Millwood's long-held mysteries if they hope to make it out of high school alive.

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