Dracula, Prisoner of Frankenstein (1972)

Plot

After Dracula claims another victim, Dr. Seward resolves to eliminate the vampire once and for all. He storms Castle Dracula wielding a hammer and wooden stake, successfully ending the Count's reign of terror. However, the next day, Dr. Frankenstein arrives with his assistant, Morpho, and a crate containing his monstrous creation. Using the blood of a kidnapped singer, Frankenstein resurrects Dracula to serve his purposes. Together with a female vampire, Dracula wreaks havoc in the town, prompting Dr. Seward to return to the castle. Sadly, he is ambushed by the creature and left gravely injured, but a gypsy named Amira comes to his aid, summoning a werewolf to confront the dark forces.