It features Nicol Williamson as Merlin and Helen Mirren as Morgan Le Fay .
John Boorman 's 1981 film Excalibur , based largely on Malory and probably the highest rated serious Arthurian film .
Excalibur features Nicol Williamson as Merlin and Helen Mirren as Morgan Le Fay .
John Boorman 's 1981 film Excalibur , based largely on Malory and probably the highest rated serious Arthurian film .