08/02/2009 (08:00PM - 09:00PM) (Sunday) : A MYSTERIOUS BLACK KNIGHT ARRIVES IN CAMELOT TO REVEAL DEEP, DARK SECRETS FROM THE PAST-At Arthur's (Bradley James) coming of age ceremony, the celebrations are interrupted when a mysterious Black Knight (Rick English) crashes the ceremony and challenges the knights of Camelot to single combat. One-by-one, each knight that he challenges dies in the fight. When one knight successfully strikes the Black Knight, Merlin's (Colin Morgan) delight turns to shock when the Black Knight is unaffected by the blow. As the truth of the Black Knight's immortal secret begins to surface, more secrets are uncovered that Uther (Anthony Head) would rather keep buried. Richard Wilson, Katie McGrath, and Angel Coulby also star.