Hellboy Animated: Blood and Iron (2007) on Netflix

Plot summary

A haunting at a mansion on Long Island brings Bruttenholm and the Bureau's top agents into a case that the Bureau itself treats as a publicity stunt. The house belongs to a celebrity billionaire with friends in the Senate, and its windows stand open while its rooms hold a lifelike replica of Erzsebet and relics from her castle. Bruttenholm asks that Hellboy, Liz Sherman, Abe Sapien and junior agent Sydney Leach take the assignment, and he travels with them without explaining his reasons. In 1939 he had hunted Erzsebet in Eastern Europe, where the vampire bathed in the blood of innocents to keep her youth; the local priest, Father Lupescu, joined the party that confronted her. At the house, the team meets an old groundskeeper.