The film centers on Dracula's plot to convert Billy the Kid's fiancee, Betty Bentley, into his vampire wife. Dracula impersonates Bentley's uncle and schemes to make her his vampiric bride.
A gloomy wood is seen as a voice is heard, narrating:
Transylvania, land of dark forests, dread mountains and black unfathomable lakes. Still the home of magic and devilry as the nineteenth century draws to its close. Count Dracula, monarch of all vampires is dead. But his disciples live on to spread the cult and corrupt the world...
A year later in 1906, following the events of the previous film, Dracula has been destroyed. Monsignor Ernest Mueller (Rupert Davies) comes to the village on a routine visit only to find the altar boy is now a frightened mute and the priest (Ewan Hooper) has lost his faith. The villagers refuse to attend Mass at the Catholic church because the shadow of Dracula's castle touches it. To bring to an end the villagers' fears, Mueller climbs to the castle to exorcise it.
The scene switches to Dracula's homeland (after a period of approximately a year), where the local villagers are enraged that yet another young woman has been murdered by the Count. With a priest's blessing, they rise up and set fire to Castle Dracula. However, the Count is safely asleep in a solid stone crypt. When the villagers return home, they find that every single woman and child in the village has been slaughtered in the church by bats.
Three English gentlemen - Hargood, Paxton and Secker - have formed a circle ostensibly devoted to charitable work but in reality they indulge themselves in brothels. One night they are intrigued by a young man who bursts into the brothel and is immediately tended to after snapping his fingers, despite the brothelkeeper's objections. The gentlemen are informed that he is Courtley, who was disinherited for celebrating a Black Mass.
On a remote island, beautiful bloodsucker Countess Nadine Carody (Soledad Miranda) lures unwary victims with her seductive nightclub act and sets her sights on Linda (Ewa Strömberg). Linda begins having dreams about Nadine, and seeks her home on an island. She is interrupted by Memmet (Jesus Franco) who warns her not to go to the island. Linda follows Memmet to his chamber where she walks in on him torturing a young woman. She escapes this encounter and proceeds to the island. On the Island, Linda meets Nadine. The two go swimming and Nadine notes that the home they are staying at used to belong to Count Dracula. After Linda begins to feel dizzy from drinking wine, Nadine takes her to a room where the two have sex and Nadine draws blood from Linda's neck. Linda later finds Nadine motionless in a swimming pool and faints.
Count Dracula's Great Love opens outside a creepy old smoke-filled sanitarium in the Carpathian mountains as two delivery men arrive with a large, heavy man-shaped crate. The owner, Doctor Wendell Marlow (Paul Naschy), has just purchased the sanitarium but has not yet moved in. Realizing that these rich castle-owning types have money and jewels just lying around, they decide to wander about and see if there is anything they can steal. One is struck in the head with an axe and the other gets his throat ripped out by a man in a black cape with velvet lining.
In 1780, Prince Mamuwalde (William H. Marshall), the ruler of the Abani African nation, seeks the help of Count Dracula (Charles Macaulay) in suppressing the slave trade. Dracula refuses to help, and transforms Mamuwalde into a vampire, whom he names Blacula and imprisons in a sealed coffin. Mamuwalde's wife, Luva (Vonetta McGee), is also imprisoned and dies in captivity. In 1972, the coffin has been purchased as part of an estate by two interior decorators, Bobby McCoy (Ted Harris) and Billy Schaffer (Rick Metzler) and shipped to Los Angeles. Bobby and Billy open the coffin and become Prince Mamuwalde's first victims. At the funeral home where Bobby McCoy's body is laid, Mamuwalde spies on mourning friends Tina Williams (Vonetta McGee), her sister Michelle (Denise Nicholas), and Michelle's boyfriend, Dr. Gordon Thomas (Thalmus Rasulala), a pathologist for the Los Angeles Police Department. Mamuwalde believes Tina is the reincarnation of his deceased wife, Luva. On close investigation of the corpse at the funeral home, Dr. Thomas notices oddities with Bobby McCoy's death that he later concludes to be consistent with vampire folklore.
One hundred years later, a new generation of Britons appear who move the tale along: in this case, a group of young hippies that includes Jessica Van Helsing (Stephanie Beacham), granddaughter of Lorrimer Van Helsing (Peter Cushing), an occult expert and descendant of Dracula's old nemesis, and Johnny Alucard (Christopher Neame), who closely resembles the disciple of Dracula seen in 1872. Alucard persuades Jessica and the others to attend a black magic ceremony in the now abandoned, deconsecrated St Bartolph's, where he performs a bloody ritual involving one of their group, Laura Bellows (Caroline Munro). Jessica and the others flee in horror, after which Dracula is resurrected and kills Laura.
Harry Williams, membre d'un groupe de rhythm and blues, Bloodstone, se cogne la tête juste avant de monter sur scène pour un concert. Le reste du film se déroule alors dans ses rêves délirants : lui-même et les 3 autres musiciens se retrouvent conducteurs d'un train dont les passagers sont des personnages célèbres de la littérature (Dracula, Scarlett O'Hara,…) ou des acteurs célèbres, avec en toile de fond la musique du groupe. Mais les conducteurs-musiciens doivent avant tout résoudre des mystères : Marlon Brando est suspecté d'avoir assassiné Nelson Eddy, Jeanette MacDonald et d'autres encore en les étouffant sous ses aisselles…
In 1904, Professor Lawrence Van Helsing (Peter Cushing) gives a lecture at a Chungking university on Chinese vampire legend. He speaks of an unknown rural village that has been terrorised by a cult of seven known as 'Golden Vampires' for many years. He goes on to explain that a simple farmer, armed with a pitch-fork and who had lost his wife to the vampires, trekked his way to the temple of the vampires, where he saw many other unfortunate women strapped to tables, waiting for their blood to be drained. The farmer burst in and battled the vampires. He is unsuccessful as his wife is killed in the fight, but in the chaos, he grabbed a bat-like medallion from around one of the vampire's necks, which he sees as the vampires' life source. Defeated, the farmer flees the temple, but the High Priest orders the vampires after him. After they leave on horseback, the High Priest summons the vampire's former victims: the 'Undead' from their graves to aid the seven vampires. Still carrying the medallion, the farmer places it around a small model of a Jade Buddha. He knocks desperately on the locked village gates, but it is in vain. The vampires and their undead catch up with him and kill him. One of the vampires spies the medallion around the Buddha and goes over to collect it. The moment the vampire touched the Buddha, the creature is destroyed in flames.
Alors qu'il n'est qu'un enfant, le fils du comte Dracula voudrait boire la potion qui lui permettra d'obtenir ses pouvoirs de vampire. Mais sa mère le lui interdit, craignant qu'il devienne comme son père décédé depuis. Seule sa mère peut toucher cette fiole, toute autre personne se changeant en pierre. Sa mère décède également. Trente-cinq ans (et demi) plus tard, Dracula cherche un sosie de sa mère pour pouvoir boire la potion vampirique. Il engage Gaston Lepope, un détective privé, qui trouve la candidate idéale en la personne d'Ariane, la fiancée de Phil. Lepope enlève la jeune femme et embarque pour Bucarest. Aidé de ses amis Jean et Gérard, Phil part à sa rescousse et se retrouve dans le château du comte Dracula junior.
A Miami businessman, John Stone, receives a parcel from England containing two old bottles of Slivovitz brandy from his recently deceased ancestor, and after drinking both bottles, becomes a vampire. Stone uses his newfound vampire powers to keep his wife, Helena, in a trance as he travels to England to kill the descendents of Abraham Van Helsing that murdered Count Dracula. Meanwhile, Helsing's distant relative, Howard Helsing, pursues Stone with the intent to put the reborn vampire to rest for good.