Shadowhunters is an American dystopian fantasy series based on the literary series The Mortal Instruments written by Cassandra Clare, developed for television by Ed Decter. The series is a second adaptation of the literary series, after the 2013 film The Mortal Instruments: City of Bones, which was also produced by the Constantin Film company. The creation of the series was announced on March 30, 2015 and premiered on January 12, 2016 in the United States, through the Freeform television network. It is the most watched series on Netflix in Portugal.
On June 4, 2018, Freeform canceled the series after three seasons, however it ordered two extra episodes for knowledge of the series' history; the second half of season three premiered on February 25, 2019, with 12 episodes ordered. The final episode aired on May 6, 2019.