The series was lavishly filmed being the first British series to be shot in colour and, using background information researched at Oxford University, featured accurate 14th Century settings, even though the legend of King Arthur and his Knights of the Round Table hailed from the 6th century. An Anglo-Saxon village with huts, sheep, goats and costumes transporting one into a world of pre-Norman Conquest days was constructed at Nettlefold Studios and used in most of the ITC series', beginning with The Adventures of Robin Hood. Outside location work was shot in Kent, where the company requisitioned Allington Castle, a fitting site for such activity since its long history included settlement by Ancient Britons, Romans and Saxons.

Writers for the series included expatriate Americans blacklisted by the McCarthy subcommittee investigating allegations of communism in (amongst other areas) the US entertainment industry. Patrick McGoohan had a minor role in one of the episodes, and it was here that he first met writer/director Ralph Smart, who would later create Danger Man, the role that would propel McGoohan to stardom.