The episode "Portrait of Louisa" was a reworking by Terry Nation of his earlier script "Lida", written for (and produced as) an episode of "The Saint". Two films were put together for European cinema distribution by ITC; these were compiled from the two-part episodes. "Mystery Island" is a re-edit of the episodes "Storm Warning" and "The Island", while "The Man in a Looking Glass" is a combination of "Masquerade" and "The Killing". This led to further European releases in the 1960s of ITC films re-edited from episodes of "The Saint", "Danger Man", "The Champions" and "Man in a Suitcase".