The Tears of Uther Pendragon (1) (S03E01)

After a year of uncertainty surrounding her fate, Morgana makes a surprising return to Camelot. While Merlin worries that she may recall the details of her disappearance and expose him to King Uther, the king enthusiastically announces a banquet in her honor. However, chaos soon ensues as dark magic begins to cloud Uther's mind, leading to dangerous hallucinations and threats looming over Camelot. Merlin suspects Morgana's involvement in the dark enchantment, but his quest for the truth puts him in grave danger. With Arthur left to confront new adversaries alone, can they save the king and protect Camelot from impending doom?