The Hellsing Agency, a secret branch of the British government, has long been battling supernatural threats to keep the people safe from creatures of the night. Its current leader, Sir Integra Hellsing, controls her own personal army to eliminate the undead beings, but even her highly trained soldiers pale in comparison to her most trusted vampire exterminator, Alucard, who is actually a powerful vampire himself. Along with Integra's mysterious butler and Alucard's new vampire minion, Seras Victoria, the Hellsing Agency must face not only regular ghouls and vampires but also a rivaling secret branch of the Vatican and a mysterious group of madmen spawned by a certain war over 55 years ago.