Uther, Gaius and others in “The Mark of Nimueh”

What's happened to him?

I don't know, sire. It's the second case I've seen today.

Why didn't you report it to me?

I was attempting to find the cause.

What did you conclude?

I don't think it's time to hurry to conclusions. The scientific process is a long one.

Why do you conceal it from me?

Sire, I have seen nothing like it. The victims are dying within twenty-four hours and it's spreading fast.

What is the cause?

I think we should say the cause, the most likely cause, is sorcery.

(taking Arthur aside) You must find who did this.

I will, father.

Conduct door-to-door searches. Increase your presence in the town. Double the guards on all the gates and lend the physician your servant.

Merlin?

I'm going to need Gaius to find a cure. He needs all the help we can give him. If Gaius is right, believe me, the city will be wiped out. This is the kind of magic that undermines our authority, challenges all we've done. If we cannot control this plague, people will turn to magic for a cure. We have to find this sorcerer and quickly.