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Unforgotten poster

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 (38,300 votes)
Episode average
8.0 -0.4 vs IMDb
Seasons
6
Streaming (US)
Amazon Prime Video
Language
EN
Type
TV series

Rating trend: this show's seasons do not settle into one shape. Rising Shows ranks whole shows by the shape of their rating trend rather than one average score, which is how you find a show that got better rather than a show that started well.

Browse shows by rating shape → Open in Rising Shows app → View on IMDb

Ratings refreshed Oct 3, 2026 · 6 seasons indexed

Cast

Seasons

Season 1 (2015)

7.98 avg 6 episodes 7.8 → 8.1 45 min avg

Ep 1: 7.8 · 1,205 votesEp 2: 7.9 · 1,009 votesEp 3: 8.0 · 951 votesEp 4: 8.0 · 937 votesEp 5: 8.1 · 911 votesEp 6: 8.1 · 976 votes
Season 1 episodes - IMDb ratings
#TitleRatingVotes
1Episode #1.17.81,205
2Episode #1.27.91,009
3Episode #1.38.0951
4Episode #1.48.0937
5Episode #1.58.1911
6Episode #1.68.1976

Season 2 (2017)

8.27 avg 6 episodes 8.0 → 8.9 45 min avg

Ep 1: 8.0 · 1,008 votesEp 2: 8.0 · 821 votesEp 3: 8.1 · 816 votesEp 4: 8.2 · 806 votesEp 5: 8.4 · 825 votesEp 6: 8.9 · 1,223 votes
Season 2 episodes - IMDb ratings
#TitleRatingVotes
1Episode #2.18.01,008
2Episode #2.28.0821
3Episode #2.38.1816
4Episode #2.48.2806
5Episode #2.58.4825
6Episode #2.68.91,223

Season 3 (2018)

8.25 avg 6 episodes 8.1 → 8.6 46 min avg

Ep 1: 8.1 · 944 votesEp 2: 8.0 · 790 votesEp 3: 8.1 · 758 votesEp 4: 8.3 · 764 votesEp 5: 8.4 · 770 votesEp 6: 8.6 · 942 votes
Season 3 episodes - IMDb ratings
#TitleRatingVotes
1Episode #3.18.1944
2Episode #3.28.0790
3Episode #3.38.1758
4Episode #3.48.3764
5Episode #3.58.4770
6Episode #3.68.6942

Season 4 (2021)

8.23 avg 6 episodes 8.1 → 8.8 45 min avg

Ep 1: 8.1 · 914 votesEp 2: 8.0 · 753 votesEp 3: 8.1 · 730 votesEp 4: 8.1 · 727 votesEp 5: 8.3 · 760 votesEp 6: 8.8 · 1,191 votes
Season 4 episodes - IMDb ratings
#TitleRatingVotes
1Episode #4.18.1914
2Episode #4.28.0753
3Episode #4.38.1730
4Episode #4.48.1727
5Episode #4.58.3760
6Episode #4.68.81,191

Season 5 (2023)

7.45 avg 6 episodes 7.3 → 7.3 45 min avg

Ep 1: 7.3 · 885 votesEp 2: 7.4 · 647 votesEp 3: 7.5 · 624 votesEp 4: 7.6 · 619 votesEp 5: 7.6 · 598 votesEp 6: 7.3 · 749 votes
Season 5 episodes - IMDb ratings
#TitleRatingVotes
1Episode #5.17.3885
2Episode #5.27.4647
3Episode #5.37.5624
4Episode #5.47.6619
5Episode #5.57.6598
6Episode #5.67.3749

Season 6 (2025)

7.52 avg 6 episodes 7.4 → 7.8 47 min avg

Ep 1: 7.4 · 729 votesEp 2: 7.4 · 562 votesEp 3: 7.4 · 522 votesEp 4: 7.5 · 488 votesEp 5: 7.6 · 470 votesEp 6: 7.8 · 606 votes
Season 6 episodes - IMDb ratings
#TitleRatingVotes
1Episode #6.17.4729
2Episode #6.27.4562
3Episode #6.37.4522
4Episode #6.47.5488
5Episode #6.57.6470
6Episode #6.67.8606

Episode ratings and vote counts from IMDb. Poster, overview, and streaming data from TMDB. Data refreshed 2026-10-03.

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