Merlin: Season 1, Episode 10

1 - 10: The Moment of Truth

When Merlin's village is attacked by Kanan, a fearsome raider, Merlin rushes home to help - and is surprised when Gwen, Morgana and Arthur insist on coming with him. It quickly becomes clear that the odds are stacked firmly against them. With dozens of lives at stake, Merlin's old friend William forces him to make a difficult choice between using magic to save his home and hiding his powers to keep Arthur's friendship.