Unforgotten (2015)

Crime · Drama · Mystery

London police detectives Cassie Stuart and Sunny Khan investigate historic cold cases involving missing persons, murder and long-hidden secrets.

IMDb rating: 8.4 (37,695 votes)
Seasons: 6
Streaming (US): Amazon Prime Video · PBS · PBS Masterpiece Amazon Channel · Thirteen · WETA+ · KQED
Language: EN
Type: TV series

Ratings refreshed Jul 3, 2026 · 6 seasons indexed

Cast

7.98 avg 6 episodes 7.8 → 8.1 45 min avg

Season 1 episodes — IMDb ratings
#	Title	Rating	Votes
1	Episode #1.1	7.8	1,170
2	Episode #1.2	7.9	985
3	Episode #1.3	8.0	930
4	Episode #1.4	8.0	917
5	Episode #1.5	8.1	892
6	Episode #1.6	8.1	956

8.27 avg 6 episodes 8.0 → 8.9 45 min avg

Season 2 episodes — IMDb ratings
#	Title	Rating	Votes
1	Episode #2.1	8.0	990
2	Episode #2.2	8.0	805
3	Episode #2.3	8.1	802
4	Episode #2.4	8.2	794
5	Episode #2.5	8.4	813
6	Episode #2.6	8.9	1,206

8.25 avg 6 episodes 8.1 → 8.6 46 min avg

Season 3 episodes — IMDb ratings
#	Title	Rating	Votes
1	Episode #3.1	8.1	930
2	Episode #3.2	8.0	780
3	Episode #3.3	8.1	750
4	Episode #3.4	8.3	755
5	Episode #3.5	8.4	759
6	Episode #3.6	8.6	931

8.23 avg 6 episodes 8.1 → 8.8 45 min avg

Season 4 episodes — IMDb ratings
#	Title	Rating	Votes
1	Episode #4.1	8.1	903
2	Episode #4.2	8.0	744
3	Episode #4.3	8.1	721
4	Episode #4.4	8.1	715
5	Episode #4.5	8.3	746
6	Episode #4.6	8.8	1,173

7.47 avg 6 episodes 7.4 → 7.3 46 min avg

Season 5 episodes — IMDb ratings
#	Title	Rating	Votes
1	Episode #5.1	7.4	865
2	Episode #5.2	7.4	632
3	Episode #5.3	7.5	608
4	Episode #5.4	7.6	603
5	Episode #5.5	7.6	584
6	Episode #5.6	7.3	732

7.52 avg 6 episodes 7.4 → 7.8

Season 6 episodes — IMDb ratings
#	Title	Rating	Votes
1	Episode #6.1	7.4	706
2	Episode #6.2	7.4	543
3	Episode #6.3	7.4	505
4	Episode #6.4	7.5	471
5	Episode #6.5	7.6	451
6	Episode #6.6	7.8	581