Arthur VS Aliens

In medieval Britain, while King Arthur and the Knights of the Round Table protect Camelot from hostile neighbors, bandits, and even their own personal issues with each other, a new threat suddenly looms. A hostile alien invasion force arrives with the intent of exterminating humanity, and terra-forming the planet for their own use. When the aliens arrive outside of the village of Camarthen, even the great wizard Merlin with all of his magic is no match for the aliens. Merlin must enlist the aid of Arthur and his knights to help, but not before making them believe that the aliens even exist and are a threat. Once the aliens commence their attack there is no stopping them. As the aliens destroy villages and kill the populace, all that our heroes can do is run as they barely survive catastrophe after catastrophe. Even Camelot with its great walls and warriors, is pathetically no match for the alien attack. Merlin, Arthur and the Knights of the Round Table must embark on a mission to unleash a magic so powerful, that it might even the tables with the aliens, all the while the characters personal issues, old enemies, and of course the aliens, constantly threaten the missions success.