Arthur's Bane (2)

Summary

As dawn breaks across the icy tundra, Merlin and Arthur are close to exhaustion. With each tortured step, the fortress of Ismere looms ever nearer and Merlin's fear intensifies. What game is Mordred playing? And what powerful secrets are Morgana and the druid Ruadan (Liam Cunningham) searching for amongst its twisted catacombs? It seems like this time, not even Merlin can stop Arthur from walking right into the lion's den… For in this bleak and transient wilderness, only one thing is certain: the great trial for Albion has finally begun.

Guest stars

• Alexander Vlahos as Mordred
• Tomiwa Edun as Sir Elyan
• Tom Hopper as Sir Percival
• Eoin Macken as Sir Gwaine
• Sophie Rundle as Sefa
• Liam Cunningham as Ruadan
• Stephen McCole as Ragnor