Merlin: Season 4, Episode 9

4 - 9: Lancelot Du Lac

Sir Lancelot makes a shocking return from the dead and old feelings reignite, making Gwen fight temptation to avoid committing an unspeakable act of betrayal that would destroy the legacy of Camelot forever. With heads and hearts at stake Merlin soon becomes suspicious. Can a man of honour break oaths and defy death or is there something darker at play?