User blog comment:Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd/Mordred????????/@comment-93.82.96.68-20111103152249

I belief that Mordred will return in the last episode of the fourth series. But Asa Butterfield will not return, because there will be another (older) actor who will play his role! That could be the reason why Asa said he will not appear in this series.