User blog comment:Rod12/The Unknown Returning Villain for Series 5/@comment-4623180-20120309053440/@comment-180964-20120309204652

Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd that is a great find with actor Fintan McKeown maybe that is the real reason why he hasn't returned to the show and why the show has only referenced his character instead of an actual official appearance. Hopefully they will find some way to giving a proper ending to King Odin's story off screen.

UPDATE: Well since the actor isn't retired that does give him a chance to return to the show but either way I do feel that King Odin's story should be concluded on the show.