Nimueh places a magic egg into water. Merlin runs into his messy room expecting Arthur to be talking about the magic book
Arthur: I found a place where you can put things. Gaius: You want to practice magic when the King is hunting for sorcerers? Merlin: When?! She turns him over. Please, Gaius, he's all I have. Arthur: We have to stop the people from using it. Uther: Then extend the search to the villages! But to save her dying father, that doesn't make her guilty of creating a plague. Arthur: With Gwen. Uther: Perhaps she cast a spell on you. The Great Dragon flies down. Morgana: Arthur? Merlin: There's a monster, an Afanc, in the water supply. That's what's causing the plague. Gwen's father, Merlin, and Morgana enters. One day.
Plan: A: Nimueh; Q: Who casts a spell on a dragon egg? A: The next day; Q: When did people start dying of a plague? A: dark blue veins; Q: What color veins do the people who die of the plague have? A: Uther; Q: Who orders Arthur to search all of Camelot for the sorcerer? A: the epidemic; Q: What does Uther believe Nimueh caused? A: only a magic trick; Q: How did Merlin avoid being found? A: his book; Q: What did Merlin save from being found? A: symptoms; Q: What did Gwen's father exhibit that caused Merlin to disregard Gaius's warning? A: Gaius's warning; Q: What did Merlin disregard when curing Gwen's father? A: the recovery; Q: What did Arthur report to Uther? A: the sorceress; Q: Who does Uther believe Gwen is? A: death; Q: What does Uther sentence Gwen to? A: Morgana; Q: Who prompts Arthur to hunt down the monster? A: an afanc; Q: What is the name of the monster that Arthur and Merlin hunt down? Summary: The dark sorceress Nimueh casts a spell on a dragon egg which she throws into the castle's water supply. The next day, people start dying of a plague which turns their skin white with dark blue veins. Uther orders Arthur to search all Camelot for the sorcerer he believes to have caused the epidemic - only a magic trick saves Merlin from having his book found. When Gwen's father exhibits symptoms, Merlin disregards Gaius's warning by curing him. However, when Arthur reports the recovery, Uther believes Gwen to be the sorceress and sentences her to death. With some prompting from Morgana, Arthur goes with Merlin to hunt down the monster (an afanc).