Episode Ratings Grid

Every episode at a glance, color-coded by rating. Rows are episode numbers within each season, columns are seasons.

M
S1
E1
7.3
E2
7.6
E3
7.8
E4
7.6
E5
8.1
E6
8.2
Avg
7.8
Great
Good
SeriesScores.com

Episode Power Rankings

The best and worst episodes at a glance. Use this to find must-watch episodes or ones you might want to skip.

🏆 Top Episodes

#1 8.2

S1E6 Episode 6

The team is reeling from a KGB bombing and the mole’s confession, but with Operation Glass hurtling towards a shocking climax, MI5 is running out of time to piece the puzzle together and avert disaster. Bobby and Wendy make a crucial discovery which could have implications at the highest levels of government.

#2
S1E5 8.1

Episode 5

The team is reeling from the shocking discovery of a mole among them, and as the Soviet plot continues unabated, it is up to Wendy to give the team the break they need. Meanwhile, when Sarah finds herself in danger, Alan is forced to make a decision that can make or break their relationship. Joe has trouble of his own when leaked information threatens the investigation and the lives of the team.

#3
S1E3 7.8

Episode 3

The team discovers a sleeper agent with terrifying connections in the US military. Faced with a formidable foe who not only appears to be a traitor, but a trained spy with access to US bases, MI5 may be out of its league. Meanwhile, Daddy is on a mission of his own to secure the safe defection of his favorite Chinese dancer. But when his assistant, Wendy, goes to carry out the admin, Bobby Waterhouse catches wind and manipulates plans to gain information about Daddy’s secret life for his own personal gain.

  1. 4. S1E2 "Episode 2" 7.6
  2. 5. S1E4 "Episode 4" 7.6
  3. 6. S1E1 "Episode 1" 7.3

📉 Bottom Episodes

#6
S1E1 7.3

Episode 1

London: 1972. When a defecting KGB officer, Arkady Malinov, reveals Operation Glass, a devastating Soviet plot that could change the course of the cold war, Daddy, the head of MI5, assembles a secret team to investigate. As the Soviets awaken a list of sleeper agents all over Britain, Daddy’s team must move swiftly to gain information about the plot. But when Joe Lambe, Daddy’s prized agent, becomes obsessed with the reappearance of a dangerous nemesis, a Soviet agent codenamed ‘Odin’, he risks letting his personal vendetta jeopardize the operation.

  1. 5. S1E4 "Episode 4" 7.6
  2. 4. S1E2 "Episode 2" 7.6
  3. 3. S1E3 "Episode 3" 7.8
  4. 2. S1E5 "Episode 5" 8.1
SeriesScores.com

The Quality Arc

Each point is an episode, plotted chronologically. The colored bands mark season boundaries. Look for upward or downward trends to see if quality improved or declined over time.

S1 6.577.588.59 Rating 1 2 3 4 5 6 Episode 10 9 8 7 6 5
SeriesScores.com

Episode Engagement

Vote count shows how many people cared enough to rate. High votes + high rating = beloved classic. High votes + low rating = notorious stinker. Low votes + high rating = hidden gem.

Rating threshold:
2 Standouts
1 Infamous
3 Hidden Gems
0 Forgettable
Standouts Infamous Hidden Gems Forgettable Global: 7.5 7.27.47.67.88.08.2 Rating 155 167 180 194 209 Votes (log scale)
Top Standout: S1E3 Episode 3
Most Infamous: S1E1 Episode 1
Best Hidden Gem: S1E6 Episode 6

Episodes plotted by rating vs. vote count. The vertical line marks the rating threshold (7.5). More votes = more engagement. Toggle above to compare against global or show-specific median.

SeriesScores.com