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 (38,000 votes)
Seasons: 6
Streaming (US): Amazon Prime Video · PBS · PBS Masterpiece Amazon Channel · Thirteen · WETA+ · KQED
Language: EN
Type: TV series

Ratings refreshed Aug 19, 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	1,188
2	Episode #1.2	7.9	998
3	Episode #1.3	8.0	942
4	Episode #1.4	8.0	925
5	Episode #1.5	8.1	901
6	Episode #1.6	8.1	965

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	1,001
2	Episode #2.2	8.0	814
3	Episode #2.3	8.1	811
4	Episode #2.4	8.2	802
5	Episode #2.5	8.4	821
6	Episode #2.6	8.9	1,215

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	939
2	Episode #3.2	8.0	785
3	Episode #3.3	8.1	753
4	Episode #3.4	8.3	759
5	Episode #3.5	8.4	765
6	Episode #3.6	8.6	936

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	908
2	Episode #4.2	8.0	748
3	Episode #4.3	8.1	724
4	Episode #4.4	8.1	720
5	Episode #4.5	8.3	751
6	Episode #4.6	8.8	1,181

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	873
2	Episode #5.2	7.4	637
3	Episode #5.3	7.5	614
4	Episode #5.4	7.6	609
5	Episode #5.5	7.6	590
6	Episode #5.6	7.3	739

7.52 avg 6 episodes 7.4 → 7.8

Season 6 episodes - IMDb ratings
#	Title	Rating	Votes
1	Episode #6.1	7.4	718
2	Episode #6.2	7.4	551
3	Episode #6.3	7.4	512
4	Episode #6.4	7.5	479
5	Episode #6.5	7.6	459
6	Episode #6.6	7.8	593