Watch a sneak peek of the episode featuring Simon's quest to remove the Mark of Cain:
The full episode can be streamed on the following official platforms: : Available for streaming with a subscription. Disney+ : The complete series is available on Disney+ . [S3E12] Original Sin
The title (Season 3, Episode 12) refers to the 12th episode of the third season of Shadowhunters , which originally aired on March 4, 2019 . Where to Watch "Original Sin" Watch a sneak peek of the episode featuring
: Episodes are often available on the Freeform website or app with a TV provider login. which originally aired on March 4
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