Original Sin[6] is the upcoming twelfth episode of the third season of Shadowhunters: The Mortal Instruments.



TMI 3x12 Sneak Peek 1

TMI 3x12 Sneak Peek 1


  • This episode will feature a "Sizzy" scene which will be accompanied by a song.[8]
  • Some scenes for this episode were shot in Paris.[9][2] Filming for these scenes took place in May 2018, after filming of 3B (specifically City of Glass).[10][7][11]
  • Show writer Bryan Q. Miller used the words "the shop" to tease the episode, suggesting that a shop may play an important role in this episode.[12] This may be referring to Kosti Lustr which is set to be featured in 3B.[13]