King Arthur (Marvel Comics) vision that his unborn son would rise up and destroy him. This ended up resulting in the birth of Mordred as Merlin worked to prepare King Arthur for the day this prophecy happens. Following a fight with the Romans, King Arthur's half-sister Morgan le Fay became one of the fiercest foes of King Arthur, Merlin, and all of Camelot. When it came to the Battle of Camlann, King Arthur and Mordred faced each other where both of them became badly wounded. In his dying breath, King Arthur instructed Sir Bedivere throw Excalibur into Lake Benoye. At first he was reluctant,
Last Rites (Once Upon a Time) a piece of the Olympian Crystal is still around, which Mr. Gold collects for a new plan. King Arthur comes inside the Underbrooke diner, confused and not knowing that he is dead, until he is reunited with Hook who after a denial and angry conversation tells him he's in the Underworld now, he asks for Arthur's help in stopping Hades. King Arthur agrees to help him after being told he can either be sent to a better place or worse place or be trapped here forever. Later, Hook and King Arthur searched Hades' lair where they look for Hades' story,