06/21/2009 (09:00PM - 10:00PM) (Sunday) : A COWARDLY KNIGHT RELIES ON SNAKES TO ATTEMPT A DEADLY MISSION-- With a shield of magical snakes, evil Knight Valiant (Will Mellor) arrives in Camelot to enter the annual sword-fighting tournament where he'll face reigning champion, Arthur (Bradley James). Meanwhile, Merlin (Colin Morgan) comes to terms with his duties of being Prince Arthur's new man-servant and brings to Arthur's attention some valuable information about Knight Valiant. When they can't prove anything to Uther (Anthony Head), Arthur is humiliated and fires Merlin. Can Merlin save Prince Arthur without revealing his magical powers? Richard Wilson, Katie McGrath and Angel Coulby also star.