The Hellsing Organization, a secret agency sponsored by the British government, has long protected humanity from supernatural threats. Led by Integra Hellsing, the organization's primary weapon is Alucard, an incredibly powerful vampire who serves as a vampire exterminator. He is joined by Seras Victoria, a former police officer recently turned into a fledgling vampire. As vampire activity rises, Hellsing uncovers a new breed of pseudo-vampires, known as Freaks, and a sinister plot by a group thought to have been destroyed decades ago, threatening England and potentially the entire world.