In the time of Jesus Christ, blacksmith Marcus (Preston Foster) is content with his life, beautiful wife Julia (Gloria Shea) and six-month-old son. However, when Julia and their child are run down by a chariot in the streets of Pompeii, Marcus spends the little money he has to pay for a doctor and medicine. Needing more, in desperation, he becomes a gladiator. He wins his fight, but in vain; his wife and child die.
As a yacht sails into an island chain in the South Pacific, a large number of natives in pontoon boats sail out to greet them. The natives dive for the trinkets the yacht's crew throws them. A shark arrives, scaring most of the natives away. In an attempt to catch a shark by throwing it bait that has been tied to a harpoon-sized hook, Johnny Baker (Joel McCrea) accidentally steps into a loop that tightens around his ankle. The shark takes the bait, and the rope grows tighter, causing the rope to yank the young man overboard. Luana (Dolores del Río), the daughter of the chief, saves his life by leaping into the water and cutting the rope.
Matt Benson est un enquêteur du FBI qui mène une enquête sur l'île de Ginostra, dominée par son volcan menaçant et en collaboration avec la police italienne sur une affaire de règlement de comptes entre mafieux locaux. Une famille a été exécutée et seul le jeune Ettore, âgé de onze ans, est rescapé et aimerait se venger. Benson accueille le garçon dans la maison qu'il loue en compagnie de sa femme sur l'île afin d'obtenir des renseignements de l'enfant. Mais des liens obscurs lient le policier américain avec d'autres habitants de l'île et les motivations des uns et des autres, tout comme celles de la police italienne impuissante devant la mafia ne sont pas simples à comprendre.
Le personnage central est un officier de liaison italien auprès des Alliés, à Naples, fin 1943, au début de la campagne d'Italie. Entre la misère et les décombres d'une ville qui vient de sortir de la guerre, le peuple de Naples tente de continuer à vivre.
In a modern day prologue, a group of hikers caught in a storm seek shelter in a cave. They encounter an anthropologist (Conrad Nagel, "The Narrator") who interprets prehistoric carvings that introduce the story of a young caveman.
À la suite d'un crash d’avion, l’aviateur Bob Mitchell et son mécanicien Jimmy Wallace se retrouvent sur une île du Pacifique. Ils ont échappé à la mort grâce à Toura, une belle jeune fille, vivant seule avec un chimpanzé et un tigre Meewa. Toura est considérée comme une déesse par les indigènes des îles voisines. Ils font la connaissance de la jeune fille très ignorante des coutumes civilisées, Bob tombant sous son charme lui enseigne même comment embrasser. Prêts à quitter l’île sur un radeau de fortune, ils sont attaqués et capturés par les cruels adorateurs du dieu Crocodile dirigés par un prêtre dément nommé Kuasa. Tous les blancs sont devenus ses ennemis mortels depuis qu’une Anglaise a rejeté une fois son amour, il s’est vengé d'elle en kidnappant sa fille Toura qu’il a installée dans l’île. Voyant que Toura veut partir, Kuasa veut la sacrifier avec ses nouveaux amis au dieu crocodile quand le volcan se met en éruption et détruit Kuasa et ses hommes. Bob, Jimmy et Toura rencontrent sur la plage des sauveteurs dans lesquels se trouve Eleanor la fiancée de Bob. Bob épris de Toura doit maintenant choisir entre elle et sa fiancée.
In Pompeii, in the year 79AD, Lysias, a wealthy young Greek, abducts the beautiful Hélène, who is a pupil of Arbax, the sinister High Priest of Isis. For revenge, Arbax causes Lysias to drink a magic potion to make him fall in love with his ally Julie, but Lysias becomes mad from the drink. Nidia, a young slave girl rescued by Lycias, has overheard the plot and accuses Arbax of trying to kill her master. Arbax kills the girl and has Lysias accused of the murder. Condemned to the lions in the arena, Lysias only escapes the punishment when the eruption of Vesuvius brings panic to the town, and he leads Hélène to safety.
Glaucus, a centurion returning to his home in Pompeii after a spell in Palestine, arrives on the edge of town just in time to see Ione, the beautiful daughter of the city's Consul, lose control of her chariot. Glaucus saves Ione's life and then heads into town to see his father. On the way, Glaucus intervenes in defense of a thief named Antonius, who is being severely punished on orders given by Gallinus, a Praetorian Guard. On arriving at his father's house, Glaucus discovers that it has been looted and his father murdered by a band of ruthless hooded thieves who have been terrorizing the city, always leaving a cross painted on a wall as a calling card. Glaucus vows revenge against the killers.
In 1865 during the American Civil War, a massive storm sweeps through a Confederate prison camp. Union soldiers Cyrus Harding (Michael Craig), Herbert Brown (Michael Callan) and Neb (Dan Jackson), are planning an escape via a tethered gas balloon. When a new prisoner, Union war correspondent Gideon Spillet (Gary Merrill), is brought into their cell, they knock out the guard and escape from the prison house. Once they arrive at the balloon, they drag one of the Confederate guards named Pencroft (Percy Herbert) aboard. After he explains that he knows how to pilot the balloon, they let him join the group.
In Pompeii 79AD, Glaucus and Jone are in love with each other. Arbace, Egyptian High Priest is determined to conquer her. Glaucus buys the blind slave Nidia who is mishandled by her owner.
À cause d'une rivalité amoureuse, Glauco, un bel Athénien aux multiples conquêtes, devient le pire ennemi d'Arbace, grand prêtre égyptien du temple d'Isis. Ce dernier a déjà éliminé un de ses proches qui menaçait de faire des révélations sur son compte et s'arrange pour faire accuser Glauco à sa place, qu'il fait jeter dans la fosse aux lions. Mais peu après, le Vésuve entre en éruption.
Bergman plays Karin, a displaced Lithuanian in Italy, who escapes the internment camp by marrying an Italian POW fisherman (Mario Vitale), whom she met in the camp on the other side of the barbed wire. He promises her a great life in his home island of Stromboli. She soon discovers that his home island is very harsh and barren, not at all what she expected, and the people, very traditional and conservative, show hostility and disdain towards this strange, foreign woman.
Durant l'été 1976, la ville de Basse-Terre est évacuée car le volcan de la Soufrière est sur le point d'entrer en éruption. Werner Herzog parcourt la ville déserte et décrit la situation.
The film features two parallel stories. The first one is set in an unknown past time and is about a young man (Clémenti) who wanders in a volcanic landscape (shot around Etna) and turns into a cannibal. The man joins forces with a thug (Citti) and ravages the countryside. At the end, his company gets arrested and during his execution, he recites the famous tagline of the film: "I killed my father, I ate human flesh and I quiver with joy." The story is about the human capacity of destruction and a rebellion against the social prerequisites implied against it.