Episode 6 of 13. First transmission on Saturday October 31st, 2009 (UK)
The official details about the episode are as follows…
Newly crowned Queen Catrina (played by Sarah Parish) settles in as Camelot’s first lady, in the second episode of the thrilling two-parter of the magical family drama series. As Queen Catrina’s true troll nature surfaces, her influence over Uther increases, and the repercussions are felt throughout the kingdom.
When Catrina accuses Merlin of stealing, he is driven into hiding. Forced to sneak around the castle, Merlin must find a way to expose Catrina’s true form without getting caught. However, even if he succeeds, will this be enough to break her powerful magic? Or will Camelot be stuck with a troll as a Queen forever?
Sarah Parish guest stars as Queen Catrina, Anthony Head as Uther and Colin Morgan as Merlin. Merlin also stars Bradley Jones as Arthur, John Hurt as The Dragon, Richard Wilson as Gaius, Angel Coulby as Gwen, Kate McGrath as Morgana and Adam Godley as Jonas.
Information on Episode 7 will be up on November 7, 2009