I know John Hurt best for his amazing voicing of The Great Dragon (Kilgarrah) in 'Merlin'. I quickly began to really like Kilgarrah himself. In my opinion, John Hurt was the best option for Kilgarrah's voice - a deep, wise voice.
Then there are documentaries narrated by John Hurt. I have only seen some of them, but from what I've seen and the way he told these documentaries, I became very interested in these documentaries. I even began to imagine Kilgarrah being the narrator of these documentaries as I delved deeper and deeper into the universe of 'Merlin'.