Hellsing Episode 13: Hellfire

Hellsing Episode 13: Hellfire is the thirteenth & Final episode in the Hellsing anime series. It was originally released in Japan on January 16, 2002 and released in English on December 27, 2003. The series is directed by Umanosuke Iida, from a screenplay by Chiaki Konaka, and produced by the Gonzo animation studio.

Plot Synopsis
In the Tower of London, Alucard faces off against the vampire Incognito, who has turned the entire Tower into his fortress using 'Magic From the Dark Continent'. Meanwhile, Seras Victoria drinks the blood of Peter Fargason and holds off the British Army by shooting their sniper with her Harkonnen. Integra and Walter attempt to fly to the tower in a helicopter, but are shot down. Walter cuts the heli in half and lowers Integra using his monomolecular razor wires, only to be captured by Incognito's converted SAS troops. Seras arrives in time to see him behead Alucard. Incognito uses Integra as a sacrifice to summon Sett into this world. Integra calls out to Alucard, telling him to grant access to his first level of power, who returns to face Incognito while Seras goes to rescue Integra, killing the last of the SAS vampires in the process. Alucard challenges Incognito, who has fused with Set, atop the Tower of London. Their battle takes place in the air before crashing into a Cathedral, which begins to burn down. Incognito mocks Alucard for attempting to shoot him with the broken remains of the Jackal, only to be pinned by a spear of silver from a melted cross. Incognito demands to know who Alucard is, and a flash of lightning reveals his true identity. Seconds later, Incognito is shown impaled by the silver spear, from crotch to mouth, further solidifying Alucard's identity.

Following a report on the incident, Integra is visited in her cell by Alucard, who is implied to offer to turn her into a vampire. She merely smiles as blood drops to the floor.