Out on a hunting trip, Arthur kills a unicorn. Merlin rushes to the animal’s side, obviously upset, as the Knights cheer Arthur for killing this most highly-prized of beasts. As the unicorn dies, Merlin sees a wizened old man watching the scene amongst the trees. Their eyes meet – a beat and then he’s gone.
The next morning, Arthur and Uther on horseback survey a valley. The crops in the fields below have died overnight. It’s the same story all over the kingdom. If they don’t do something, the people will starve. When later that day, the water in Camelot’s well turns into sand, Arthur and Uther become desperate – the town is now facing a famine and a drought. Gaius suggests that these events cannot be a coincidence – a curse has come to Camelot.