Lost Souls[4] is the upcoming eleventh episode of the third season of Shadowhunters: The Mortal Instruments.


In the emotional midseason premiere, everyone is dealing with the loss of Clary and are trying to move on best they can. Unbeknownst to them, the Shadowhunters face a new level of evil that they can't even imagine with the arrival of Jonathan Morgenstern, the true form of Clary’s brother.

With the loss of Clary after Lilith’s apartment exploded, Alec, Isabelle and Jace try to come to terms with what has happened. Glad to have their brother back, Alec and Isabelle are still worried about Jace, who is taking the actions of the Owl very hard. Magnus is also mourning the loss of his magic and finds himself in a new position—having to rely on others for help.

Meanwhile, Maia tries to help a devastated Simon who has lost his family and his best friend. But unknown to everyone, Clary is alive and finds herself in a new and dangerous predicament.



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TMI S3B Trailer 01

TMI S3B Trailer 01

First teaser for 3B


  • Filming for this episode began on January 22, 2018.[7][2]
  • The title "Lost Souls" partially shares the title with one of its main source materials, City of Lost Souls.
  • The episode will be set a day after the end of the previous episode.[8]
  • Alec and Magnus will be babysitting Madzie in this episode.[1][9][10]
  • Show writer Bryan Q. Miller used the words "the knife" to tease the episode, suggesting that a knife may play an important role in this episode.[11]
  • The episode was initially slated to premiere on August 14, 2018 before it was pushed back to 2019 following the show's cancellation.[12][1]