The 'Hellsing' manga, written and illustrated by Kouta Hirano, began serialization in Shounen Gahousha's 'Young King OURs' magazine, introducing the original story that would inspire later adaptations.
The original 'Hellsing' anime TV series premiered in Japan, adapting the early parts of the manga but deviating from its storyline in later episodes.
Production of the 'Hellsing Ultimate' OVA series began, aiming to adapt the manga more faithfully than the original 2001 anime and with higher animation quality.
The first episode of the 'Hellsing Ultimate' OVA was released, marking the beginning of a popular high-quality adaptation of the manga.
The final episode of the 'Hellsing Ultimate' OVA series was released, concluding the faithful anime adaptation of the manga.
Alucard, a powerful vampire, pledges loyalty to the Hellsing family and serves as their supernatural weapon.
Integra Hellsing inherits the leadership of the Hellsing Organization after the death of her father and vows to continue the fight against the undead.
The Vatican forms the Iscariot Organization, a secret religious group combating supernatural threats, often clashing with Hellsing.
Walter, a skilled surgeon and combatant, becomes part of the Hellsing Organization, assisting in their deadly missions.
The Millennium Organization, a Nazi vampire group, awakens and launches an attack against Hellsing to start a war involving vampires and the world.
Hellsing Organization, with Alucard and other operatives, confronts Millennium in a massive battle across London involving vampires, ghouls, and special forces.
Seras Victoria, a former police officer, is turned into a vampire by Alucard and joins the Hellsing Organization as a vampire operative.
The climax involving Father Enrico Maxwell and the Iscariot's attempt to eliminate Alucard and the Hellsing Organization.
