Set in a world where vampires, ghouls, and other creatures of the night lurk in the shadows, "Hellsing Ultimate" follows the enigmatic Hellsing Organization, a clandestine British agency tasked with defending humanity against the forces of darkness. Led by the formidable Integra Hellsing and aided by the ancient and powerful vampire Alucard, the organization wages a relentless battle against those who would threaten the fragile peace of the world.