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Currently you are able to watch "Pretty Little Liars: Original Sin - Season 1" streaming on BINGE, Foxtel Now or buy it as download on Apple TV, Fetch TV.
There are no options to watch Pretty Little Liars: Original Sin for free online today in Australia. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
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In 1999, tragic events threatened to rip apart a close-knit circle of friends and the small town of Millwood. Twenty years later, a new group of Millwood High students is hunted by an assailant known as "A," who threatens to make them pay for their parents' past transgressions and sins of their own.