Darkness steals into the very heart of Camelot, as Morgana and her puppet Queen hatch a sinister plan to murder the King. But when stable hand Tyr Seward becomes caught in the crossfire, he threatens to ruin everything… As the plot thickens and reaches its deadly climax, can a suspicious Merlin unravel the truth before it’s too late?
Elenco: Colin Morgan , Bradley James , Angel Coulby , Katie McGrath , John Hurt , Richard Wilson , Eoin Macken , Katie McGrath , Richard Wilson , Rupert Young , Santiago Cabrera , Tom Hopper .