The Knight series is one of my favorite series that Mego produced. They had great heads and outfits plus cool accessories. At the moment, Ivanhoe seems to be the easiest one to find. Last year, King Arthur was the most common. When I first started collecting Megos, the Black Knight was the only one that I could find and now he seems to be the most difficult to complete. The Black Knight has the same head as Wild Bill from the Western series. King Arthur has the same head as Kit Carson from the Tex Willer series and Buffalo Bill only the King has brown hair, Kit Carson has white hair and Buffalo Bill has grey hair. Sir Galahad has the same head as Will Scarlet from the Robin Hood series. Ivanhoe and Sir Lancelot do not share heads with any other character.
(click on the picture of a knight to see a close up of his head with and without his helmet)