TV Equals starts off with a major spoiler for those who have not yet seen the episode.
“I’m beginning to think the folks behind Merlin are skilled in the art of torture. In ‘The Death Song of Uther Pendragon’, Merlin’s secret is very almost revealed. Key word being ‘almost’.”
The episode had us sitting on the edge of our chairs as TV Equals states in the review of the 3rd episode of Merlin season 5.