Hellboy comes to England, where he must defeat Nimue, Merlin's consort and the Blood Queen. But their battle will bring about the end of the world, a fate he desperately tries to turn away.
When the child Arthur’s father is murdered, Vortigern, Arthur’s uncle, seizes the crown. Robbed of his birthright and with no idea who he truly is, Arthur comes up the hard way in the back alleys of the city. But once he pulls the sword Excalibur from the stone, his life is turned upside down and he is forced to acknowledge his true legacy... whether he likes it or not.
The young Arthur runs the back passages of Londonium with his crew, not knowing his royal lineage until he grabs Excalibur. Instantly confronted by the sword's influence, Arthur is forced to make up his mind. He joins the rebellion and a shadowy young woman named Guinevere, he must learn to understand the magic weapon, deal with his demons and unite the people to defeat the dictator Vortigern, the man who murdered his parents and stole his crown to become king.