The cover is about McGoohan Danger Man.
http://www.danger-man.co.uk/tvtimes.asp
The Prisoner was going to be a sequel to Danger Man and one character ‘Potter’ played by Christopher Benjamin does appear in both series.
http://en.wikipedia.org/wiki/Danger_Man#Later_history.2C_Koroshi_and_transition_to_The_Prisoner
The cover is about McGoohan Danger Man.
http://www.danger-man.co.uk/tvtimes.asp
The Prisoner was going to be a sequel to Danger Man and one character ‘Potter’ played by Christopher Benjamin does appear in both series.
http://en.wikipedia.org/wiki/Danger_Man#Later_history.2C_Koroshi_and_transition_to_The_Prisoner