Series 3 will be starting on the Saturday 11th of September on BBC One and in HD.
From BBC Press Office
It has been a year since Lady Morgana disappeared and no trace of her has been found, as the fantasy drama starring Colin Morgan, Bradley James, Anthony Head and Richard Wilson returns for a new series.
Just as it seems all hope is lost, Merlin and Arthur pick up a trail. Set upon by bandits it seems they may perish but Merlin's secret magic saves the day. As the dust settles, a mysterious, bruised and bloodied figure approaches the group: it's Lady Morgana.
Camelot rejoices at her return but Merlin is worried that Morgana will remember the circumstances of their last meeting and tell King Uther that he tried to kill her. The King will not understand that he did it to save Camelot from Morgana's half-sister, sorceress Morgause's deadly enchantment; Merlin would be executed on the spot.
Morgana promises Merlin that she has learnt the error of her ways and repents for the evil things she has done. Morgause no longer has any hold over her and Morgana forgives Merlin and promises to keep his secret.