Series 3 London police detectives Cassie Stuart and Sunny Khan investigate historic cold cases involving missing persons, murder and long-hidden secrets. Details Casts Videos Galleries Posters Season Lists Episode Lists Title Series 3 Genres Drama Crime Mystery Air Date 2018-07-15 Episode Runtime 00 Hours 46 Minutes Season Number 3 Episode Count On Season 3 6 Production Companies Mainstreet Pictures Sanjeev Bhaskar... DS Sunil 'Sunny' Khan... Nicola Walker... DCI Cassie Stuart... Carolina Main... DC Fran Lingley... Jordan Long... DS Murray Boulting... Lewis Reeves... DC Jake Collier... Peter Egan... Martin... Alastair Mackenzie... John Bentley... Elliot Morris... Asif... Tom Rhys Harries... Elliot Hollis... Siobhan Redmond... Derran Finch... Sara Stewart... Mel Hollis... Kevin McNally... James Hollis... Brid Brennan... Suzanna Reid... James Fleet... Chris Lowe... Indra Ové... Maria Carr... Emma Fielding... Amy Hollis... Gerald Kyd... Adrian Mullery... Unforgotten | ITV (Trailer) Unforgotten | Series 1 | ITV (Trailer) Original Size (1280x720) Original Size (1920x1080) Original Size (3840x2160) Original Size (2560x1440) Original Size (1920x1080) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (1920x1080) Original Size (1920x1080) Original Size (1920x1080) Original Size (1920x1080) Original Size (3840x2160) Original Size (1920x1080) Original Size (1920x1080) Original Size (960x1440) Original Size (960x1440) Original Size (670x1005) Original Size (1000x1500) Original Size (680x1000) Original Size (1000x1500) Original Size (680x1000) Original Size (680x1000) Original Size (680x1000) Original Size (2000x3000) Original Size (1000x1500) Original Size (2000x3000) Original Size (720x1080) Original Size (1055x1500) Original Size (680x1000) Original Size (1333x2000) Season 1 6 Episode(s) 2015-10-08 Season 2 6 Episode(s) 2017-01-05 Season 3 6 Episode(s) 2018-07-15 Season 4 6 Episode(s) 2021-02-23 Season 5 6 Episode(s) 2023-02-27 Episode 1 2018-07-15 Episode 1... Episode 2 2018-07-22 Episode 2... Episode 3 2018-07-29 Episode 3... Episode 4 2018-08-05 Episode 4... Episode 5 2018-08-12 Episode 5... Episode 6 2018-08-19 Episode 6...