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.
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A list of the songs and score music featured in this episode:
- "Lost Without You" - Freya Ridings
- The title "Lost Souls" partially shares the title with one of its main source materials, City of Lost Souls.
- Filming for this episode began on January 22, 2018.
- A scene in this episode, featuring Raphael Santiago preparing food at a soup kitchen, was shot in the actual cafeteria of the studio where the show was being filmed.
- The episode was initially slated to premiere on August 14, 2018 before it was pushed back to 2019 following the show's cancellation.
- "Production on 3B begins Jan 22." Todd Slavkin on Twitter
- "Season 3B has officially begun!" Matt Hastings on Twitter
- "...it's the actual cafeteria at the SH studio..." Luke Baines]] on Twitter
- Shadowhunters on Netflix (on mobile; removed in May 2018)
- "Season 3B premieres Aug 14th on @FreeformTV @mattdirector directs a script by me & @DSwim #lostsouls #unclesbabysit" Todd Slavkin on Twitter (deleted; screenshot here)