Guest Stars Norman Chappell as Sir William Joan Sims as Lady Guinevere Brian Capron as Trumpeter Desmond McNamara as Minstrel Kenneth Connor as King Arthur Peter Butterworth as Merlin Jack Douglas as Sir Gay Billy Cornelius as Man-at-arms Oscar James as Black Knight Bernard Bresslaw as Sir Pureheart Victor Maddern as Sir Osis Ronnie Brody as Shortest Knight Valerie Walsh as Lady Ermintrude