The third season of Shadowhunters: The Mortal Instruments was officially announced on April 21, 2017. It will consist of 20 episodes and premiered on March 20,[1] 2018.[2][3][4]

Known information

SPOILER WARNING: Plot details follow. Caution is advised!
New characters:
  • Asmodeus has been cast and will be introduced.[5][6][7]
  • Helen Blackthorn will be introduced in 3B, and "Heline" may be featured.[8][9] She may be introduced as "a science loving half Seelie/half Shadowhunter".[10]
Clary and Jace:
  • The consequences of wishing for Jace's resurrection will be revealed.[17][18]
  • Clary will be in touch with her parents'/families' connections.[19]
  • There will be a new rune.[14]
Magnus and Alec:
  • Alec being drunk is set to be shown.[20]
  • The mortality and immortality issue between Malec will be tackled.[21]
  • Alec's storyline will continue to involve politics (and his continued leadership of the Institute), family matters, and his relationships with his parabatai Jace and the love of his life, Magnus.[22]
  • Magnus's Indonesian roots will be on display.[6]
  • Magnus and Alec may have a training scene.[23]
  • There will be some Malec "domestic" moments.[24][25][16]
  • Todd: "French toast, Julia Child, a very special box, a very special Spaniard, working together/loving together".[26]
Isabelle Lightwood:
  • Izzy will be "building weapons", supporting her friends and battling demons, repairing jewelry (her necklace, see below and 3x02), and possibly "falling in" love.[27]
  • Her being a forensic pathologist will be on display again, as well as being a "physicist, metallagurist, gemologist, engineer, whip-master, advice-giver, sister, daughter, friend," and possibly as a girlfriend.[28]
  • Izzy developed new found respect for mundanes after her AA meetings in Season 2.[29]
  • Izzy will once again save Simon.[30]
  • Izzy will further learn "to open up her heart", possibly with help from a special someone.[31]
  • A scenario involving Sizzy and a tunnel may be featured.[32]
Luke & Maia:
  • Luke will get a potential love interest,[11] and he may go on a date with Maryse Lightwood.[33]
  • More of his backstory will be explored.[34]
  • Luke will become protective of the Downworld and things will heat up between them now that Ollie knows.[35][36]
  • More of Maia's backstory will be explored.[37][38]
  • Maia will struggle with the idea of forgiveness.[39]
  • Maia is "studying marine life, pouring drinks, worrying about her boyfriend, educating Bat, and of course kicking ass" and still living the "pack life" this season.[40]
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Other characters:
Other returning characters:

Cast and characters

Main characters:

Recurring characters:

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Title Written by Directed by Airdate Episode
On Infernal Ground Todd Slavkin & Darren Swimmer Matt Hastings March 20, 2018 3x01 34
TMI301promo Meeting01 Secrets abound as the Shadowhunters and Downworlders try to get back to normal after Valentine's death. Alec pushes Jace to come clean about whatever Jace and Clary are hiding. Meanwhile, Lilith sets a plan in motion in New York City as Simon spends time in the Seelie Court.
The Powers That Be Peter Binswanger Peter DeLuise March 27, 2018 3x02 35
TMI302promo Magnus &amp; Lorenzo 01 The warlocks' magic is becoming corrupted by a demonic presence while Izzy and Luke try to track down more information on the recent series of possessions.
What Lies Beneath Alex Schemmer Amanda Row April 3, 2018 3x03 36
TMI303promo Malec &amp; Maryse 03 The Shadowhunters try to track down the new imposing threat, while Jace has a suspicion that Jonathan is back and behind the mundane attacks. Simon tries to figure out what the Seelie Queen did to him during his time in the glade. Alec decides to host a Lightwood family dinner at Magnus' house after a surprising visit from Maryse.
Thy Soul Instructed Jamie Gorenberg Emile Levisetti April 10, 2018 3x04 37
TMI304promo Jordan &amp; Simon 03 Jace's concerns grow about his mental state and turns to Luke for information on his family's past. Clary and Izzy go after a rogue vampire and Simon hunts for a new apartment.
Stronger Than Heaven Brian Millikin Geoff Shotz April 17, 2018 3x05 38
TMI305promo Jace &amp; Simon 03 Someone is out to get Simon and Jace is on the hunt to find out who it is. Meanwhile, Clary turns to Luke to find a way to help Jace. Alec worries about the future of his relationship after learning more about Magnus' romantic past.
A Window Into an Empty Room Aisha Porter-Christie Alexis O. Korycinski April 24, 2018 3x06 39
TMI306promo Jace &amp; Lilith 02 Clary teams up with Magnus to investigate a recent demon attack. Simon is stunned with he's visited by someone he never thought he'd see again, and who now won't seem to leave. Meanwhile, Izzy worries about dinner with her family and a special guest and Luke reaches out to Maryse.
Salt in the Wound Celeste Vasquez Joshua Butler May 2018 3x07 40
A Heart of Darkness Jamie Gorenberg Ari Sandel May 2018 3x08 41
Familia Onte Omnia Taylor Mallory Matt Hastings May 2018 3x09 42
Erchomai Bryan Q. Miller Jeffrey Hunt May 29, 2018 3x10 43
Lost Souls TBA Matt Hastings 2018 3x11 44
Original Sin TBA Matt Hastings 2018 3x12 45
Beati Bellicosi TBA TBA 2018 3x13 46
A Kiss From a Rose TBA Salli Richardson-Whitfield 2018 3x14 47
To the Night Children TBA Siluck Saysanasy 2018 3x15 48
Stay With Me Aisha Porter-Christie Amanda Row 2018 3x16 49
Heavenly Fire Celeste Vasquez Shannon Kohli 2018 3x17 50
The Beast Within Taylor Mallory Joshua Butler 2018 3x18 51
Aku Cinta Kamu Jamie Gorenberg Todd Slavkin 2018 3x19 52
City of Glass Bryan Q. Miller Matt Hastings 2018 3x20 53



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The renewal for the season was announced on April 21, 2017, during a live chat on Facebook with the cast.[2]

The writers began to officially meet to work on the season on May 30, 2017.[45][46] On July 20, 2017 at SDCC, it was announced that Alisha Wainwright was promoted to series regular as Maia Roberts.[47][48] On October 7, 2017 at NYCC, it was announced that Freeform officially ordered the additional 10 episodes (3B) to air in the summer of 2018,[49] meaning there will be little to no hiatus after episode 10 and the whole season will air in 2018.[50] The original premiere date that was announced was the 3rd of April, before it was announced in December that the premiere had been moved to the 20th of March,[1] two weeks earlier than the original plan.

Filming began on August 21, 2017 and is expected to run until May 15, 2018.[51][52][53][54] Production took a break on December 6, 2017,[55][56] and resumed on January 22, 2018.[57][58]

See also


  1. 1.0 1.1 New premiere date reveal | TVLine
  2. 2.0 2.1 Live video chat announcementShadowhunters on Facebook
  3. ‘Shadowhunters’ Renewed For Season 3 By Freeform | Deadline
  4. Shadowhunters on Twitter: #Shadowhunters returns Tuesday, April 3 at 8/7c
  5. 5.0 5.1
  6. 6.0 6.1
  11. 11.0 11.1 11.2
  13. 13.0 13.1
  14. 14.0 14.1
  15. 15.0 15.1
  16. 16.0 16.1
  36. Shadowhunters Season 3 NYCC Trailer
  45. "#shadowhunters Season 3 writers room now in session!" Darren Swimmer on Twitter
  46. "Day 1!" Zoe Broad on Twitter
  47. "‘Shadowhunters’: Alisha Wainwright Upped To Regular For Season 3 – Comic-Con" - Deadline
  48. "@WainwrightAE is a series regular in Season 3! 🙌 #ShadowhuntersAtSDCC" Shadowhunters on Twitter
  49. Freeform Orders 10 More Episodes Of ‘Shadowhunters’ | Deadline
  50. "Just 20. The entire season will air 2018." Matt Hastings on Twitter
  51. In Production list at OMDC
  52. "Once more unto the breach, dear friends, once more; #shadowhunterstv #ShadowhuntersSeason3" John Rakich on Twitter
  53. "Round 3, Angels... Are you ready? #ShadowhuntersSeason3" Katherine McNamara on Twitter
  54. "Back in the saddle again. #shadowhuntersseason3" Matt Hastings on Twitter
  55. "That's a wrap for your girl Fray on #ShadowhuntersSeason3 A!" Katherine McNamara on Twitter
  56. "On the wrap of production for Season 3A," Darren Swimmer on Twitter
  57. "Production on 3B begins Jan 22." Todd Slavkin on Twitter
  58. "Season 3B has officially begun!" Matt Hastings on Twitter