Jason, a fearless sailor and explorer, returns to his home land of Thessaly after a long voyage to claim his rightful throne. He learns, however, that he must first find the magical Golden Fleece. To do so, he must embark on an epic quest fraught with fantastic monsters and terrible perils.

Studio 4 is a BBC drama anthology series, filmed at the BBC TV Centre's Studio Four, and screening over two seasons in 1962. The series was envisaged as a sequel to Storyboard, an anthology series which had been transmitted the previous year.