Black Lake (Swedish: Svartsjön) is a Scandinavian thriller television series, devised by Ulf Kvensler and co-produced by TV3 Sverige, TV3 Danmark, TV3 Norge, Viaplay, and Jarowskij, that first broadcast in Sweden and Denmark in October 2016. The first eight-part series, which also alludes to hints of the supernatural and horror genres, is based around a disused ski resort in the north of Sweden, and was written by Kvensler, Moa Herngren, Peter Arrhenius, and Jonathan Sjöberg, and directed by Sjöberg and David Berron. The first series broadcast on BBC Four in the United Kingdom from 16 September to 7 October 2017, with two episodes broadcast back-to-back each week. The first series was later released on Region 2 DVD on 9 October 2017.A second series was announced in 2017, serving as a prequel to the first. The main characters were Filip Berg, returning from the first series, joined by Hedda Stiernstedt, Daniel Larsson, David Nzinga, Bahar Pars and Alida Morberg. The second series follows Johan (Berg) as he and five other participants take place in a rehabilitation programme on the island of Kallskär. The second series broadcast in Sweden and Denmark from October 2018, followed by a BBC Four broadcast commencing on 29 December 2018. A Region 2 DVD release has been set for 18 March 2019.