Faced with the possibility of a gruesome fate research librarian Katherine Pendragon inadvertently summons the sword of legend Excalibur. Now possessing the Spirit of Justice that resides within the mystic blade and teamed up with the legendary wizard Merlin, Katherine dispenses justice in modern day London. But is something more sinister on the horizon? Is there another reason for the swords return? Find out when Lady Excalibur and her friends take on an ancient evil.