Merlin 5.03: The Death Song of Uther Pendragon

See my round-ups of previous episodes in Merlin series 5: Arthur's Bane Part 1 and Arthur's Bane Part 2

We start out fairly innocuously with Arthur and Merlin out in the forest, hunting. Why Arthur decides to take only Merlin with him on a hunting trip is beyond me (and beyond Arthur, too) but I digress. They hear screams and stumble upon a village sacrifice with a human as the aforementioned unfortunate. The woman is about to be burned at the stake for sorcery but Arthur forces the village leader at swordpoint to release the woman and take her into the woods. She's on her deathbed but gives Arthur a gift to thank him for his "kindness and compassion." It's a horn, but not any ordinary horn: "It has the power to summon spirits of the dead" and Arthur has a very clear idea about what he's going to do with it.

Back in Camelot, it's the anniversary of Arthur's coronation - and also of Uther's death. As a result, Arthur is deeply unhappy and he doesn't even want to talk to Gwen about it. The next morning, he orders Merlin to ready their horses and not let anyone know that they're going on a trip.  They arrive at the Great Stones of Nematon - which looks very like Stonehenge - in order to call upon Uther's spirit as Gaius had said of the legend.