Camelot - The Long Night

Night four of the Camelot 'Mini-Series' starts with the episode, The Long Night and this is exactly how it felt watching this meandering mess of an episode.  The wheels well and truly began to fall off this show at this point and they probably lost heaps of viewers I would think.
Morgan once again invites Arthur and his Knights to Castle Pendragon, which he goes to for some reason!?  While there, Morgan gives them food and drink and woman and then in the dead of night, creates a fake attack on the castle.  I am not really sure what the purpose of all this was but by the end of the episode, Arthur and his people return to Camelot unknowingly taking Morgan with them.  She has taken the guise of Igraine who is now locked and chained within the Castle.
A pointless storyline.