Episode Ratings Grid

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Episode Power Rankings

The peaks and the valleys. Find the essential episodes — and the ones to skip.

#1
S1E6 8.2
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.

#4 Episode 2 S1E2 7.6
#5 Episode 4 S1E4 7.6
#6 Episode 1 S1E1 7.3

Lowlights

#6 S1E1 Episode 1 7.3

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.

#5 Episode 4 S1E4 7.6
#4 Episode 2 S1E2 7.6
#3 Episode 3 S1E3 7.8
#2 Episode 5 S1E5 8.1

The Quality Arc

Each point is an episode, plotted in order. Colored bands mark season boundaries. Look for the rise, the plateau, or the decline.

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Episode Engagement

High votes + high rating = beloved classic. High votes + low rating = notorious stinker. Low votes + high rating = hidden gem.

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