User blog comment:MerlinNimueh/Series 5: confirmed facts/@comment-4690063-20111220204548/@comment-4690063-20111231194420

A lots of fans want Nimueh, because she isn't back. The producers said that Uther could return in Series 5, the witch is better than him. He isn't very important in the legend, they gave him much importance. Now Arthur is the King, Uther's return would be useless.