This film is often confused with the ITV cult classic science fiction series The Prisoner (1967). This is largely due to the fact that they are similar thematically and both productions star Patrick McGoohan.
Patrick McGoohan is still widely known for his 1967-68 television series "The Prisoner". But in addition to this televised version of "The Prisoner" film of 1955, a 1960 episode of "Danger Man" was called "The Prisoner" as well. That means McGoohan starred in THREE different "Prisoners" in 7 years.