A year has passed since Morgana has gone missing and King Uther has not lost hope in finding her. Despite Gaius’ advice Uther refuses to call off the search for Morgana. Prince Arthur and Merlin were on a patrol when they found an abandoned camp. A skirmish broke out and Merlin has to secretly use magic to save Arthur. After the scuffle was over they found an exhausted Morgana. She was then brought to Camelot and was immediately attended by Gaius. King Uther wanted to talk to her but Gaius advised him that it would be better if she gets some rest.
Merlin was then summoned to Morgana’s chamber. Merlin feared that Morgana would tell Uther that he tried to poison her. In the last season Merlin tried to poison her to lift the sleeping spell over Camelot. Arthur was already in Morgana’s chamber when Merlin arrived. When he left, Merlin was asked to stay. Morgana told him that she knows that he tried to poison her. But she then told him that he understand why he did it and she would have done it herself. Morgana does seem to hold any grudges against Merlin and everything seems fine.

Morgana then talk to King Uther who fell into tears when he talked to her. She then used a handkerchief to acquire Uther’s tears. She then met when her sister, Morgause, to make a spell to put fear into Uther. Using a enchantment, Uther saw those he ordered drown because they are suspected to posses magic. 

He was in constant fear and they feared that king was going mad. Rumors swiftly spread of Uther’s condition. Merlin then discovered the source of Uther's hallucination and that Morgana was behind the spell. He then followed her to the woods and discovered that Morgana was in league with her sister. Morgause has found an ally that agreed to attack Camelot while Uther is in his current condition.
Morgana knew all along that she was being followed and Morgause cast a spell to bind Merlin. He was then left in the woods and several giant scorpions appeared. Merlin was defenseless then and eventually got stung. He was left with no choice but to seek the help of the dragon Kilgarrah and was saved.