First MGM film to be shot in CinemaScope.
Stanley Baker was hired at very short notice after George Sanders, had to be replaced due to illness. Baker was cast as Mordred following his acclaimed portrayal of a villainous Royal Navy officer in Der große Atlantik (1953).
The UK's first CinemaScope production, and also its first widescreen feature.
The first film in CinemaScope which was not produced by 20th Century Fox.
Anne Crawford, who plays Morgan Le Fay, was only 7 years and 3 months older than Stanley Baker, who plays her son Modred.