erlin accidentally releases a malicious goblin from a secret chamber and it casts a spell on Uther, making him lose all his hair. Gaius and Merlin try to catch it but it inhabits Gaius, possessing him and making him rude and greedy, selling bogus potions in exchange for gold. Before Merlin can act, the goblin, speaking through Gaius, denounces him as a sorcerer and he is imprisoned. Arthur believes in Merlin's innocence but he is turned into a donkey after confronting the possessed physician, and Merlin, helped only by Guinevere, must bring Gaius close to death so that the goblin will leave him and can be recaptured.

Résumé de IMDb.com