Pretty Little Liars: Original Sin Season 1 - Watch Online

Pretty Little Liars: Original Sin Season 1 Episodes

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Pretty Little Liars: Original Sin TV Listings Guide Seasons & Episodes Cast

Season 1 Episode Guide

Episode 1 - Chapter One: Spirit Week

Pretty Little Liars: Original Sin takes viewers to Millwood, a blue-collar town still healing from tragic events that took place 20 years ago. An unknown assailant has begun tormenting a disparate group of teen girls - a new generation of "Little Liars" - to make them pay for their parents' secret sin... as well as their own.

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's deadly aftermath, Imogen attempts to connect the dots between her former BFF, her deceased mother, and the mysterious "A." Then, as Sheriff Beasley closes in, the fate of the friend group hangs in the balance.

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 work together to uncover Imogen and Tabby's assailant during the Annual Thanksgiving Millwood High Blood Drive. Later, Sidney confronts Tabby about her secrets.

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 in by a vengeful masked assailant in the present.