Plot
The twin cities of Sodom and Gomorrah prosper because of their great deposits of salt, which are mined by an army of slaves. The decadent citizens, who have become wealthy by trading salt, live in luxury and use slaves as servants and for violent games of entertainment.
After a night of revelry, Astaroth (Stanley Baker), the Prince of Sodom, tells slave girl Tamar (Scilla Gabel) to carry a message to the king of the Elamites, with whom he plans to overthrow his sister, Bera, Queen of Sodom (Anouk Aimée). Returning from her meeting in the desert with the Elamite leader, Tamar is captured by a Sodomite patrol. Queen Bera demands the name of her co-conspirator. Tamar refuses to speak under interrogation and Bera has her and her two young sisters killed.
Meanwhile, Lot (Stewart Granger) leads his family and a Hebrew tribe through the desert, hoping that he can find a permanent home for his people along the fertile banks of the River Jordan. By contrast with the people of the twin cities, the Hebrews are presented as a pious and austere people with high moral standards. As the Hebrews approach their destination, Lot meets the beautiful Ildith (Pier Angeli), who luxuriates in a litter while a group of slave girls in chains precede her over the rocky terrain. Lot assumes that Ildith owns these women. She tells him that she is also a slave, albeit the chief of the Queen of Sodom's body slaves. Lot tells her that owning slaves is evil.
Once Lot and his people reach the Jordan, he negotiates the use of the land on one side of the river with Queen Bera, promising her both grain and defense should Sodom's desert enemies attack. In a surprising turn, she gives Lot Ildith, who does not wish to leave the queen or her life of luxury in Sodom. Astorath is disgusted and baffled by his sister's easy terms with the Hebrews. However, he soon turns his attentions to Lot's flirtatious daughter, Shuah (Rossana Podestà).
Ildith dislikes the rough conditions of the Hebrew camp, but soon befriends Lot's daughters. She and Lot also fall in love and plan to marry. Meanwhile, Shuah and Astaroth begin a secret affair. Lot's other daughter, Maleb (Claudia Mori) and his headstrong lieutenant, Ishmael (Giacomo Rossi Stuart) also plan a marriage.
Lot and Ildith's wedding day celebrations are interrupted by an Elamite attack. Although the Hebrew farmers and the Sodomite soldiers fight valiantly, they are nearly defeated by the fierce nomadic warriors. In a last, desperate measure, Lot orders that the dam that the Hebrews have built be broken. His quick thinking saves the twin cities and the Hebrews, but the camp and the crops are destroyed. However, the flood waters reveal that the Hebrew camp is also the site of a vast salt deposit. Lot now believes that the Hebrews can move out of the wilderness and live among the Sodomites ("separate, but in their full view", he cautions) by selling salt.
Some time later, Lot and Ildith now live in luxury in Sodom. Sodomites and Hebrews both revere Lot and seek his judgment. Ishmael however, believes that Lot has succumbed to luxury and instead should liberate Sodom's mine slaves. Lot disagrees and advises Ishmael to wait, believing that the Sodomites will change their ways in time. Ishmael does not heed Lot and unsuccessfully tries to set the slaves free, believing that the Hebrews will harbour them. Instead the Hebrews shut their doors on the desperate escapees who are soon recaptured and sentenced to death. As the newly appointed minister of justice, Lot must now sentence Ishmael. However Ishmael is only one of Lot's problems, as he is confronted by the jealous Astaroth, who tells him that not only has he slept with both of Lot's daughters, but that Ildith had known and kept the affairs secret. An outraged Lot kills Astaroth.
At this point, Queen Bera's plot becomes clear: she used the Hebrews to destroy the Elamite threat and also used Lot to rid her of her scheming brother. Lot becomes deeply remorseful that he has not only killed but he led his family and people into sin. Bera has him taken to prison.
While Lot asks God for forgiveness and guidance, two angels appear to tell him that God is displeased with the twin cities and will destroy them. Lot pleads with the angels to spare the city if he can find just ten Sodomite citizens who will repent and leave the cities with him. The angels agree and free both Lot and Ishmael from prison after warning Lot that anyone leaving Sodom who looks back will be struck down as well.
Meanwhile, many recaptured slaves are tortured to death on the wheel. Queen Bera exclaims "But wait, the entertainment has just begun", as Lot appears seeking ten righteous Sodomites. Although he has God's consent, Lot finds it impossible to persuade any Sodomite citizens to follow him; only the slaves are willing to accompany him. Even his own daughters, who believe Lot a hypocrite, at first refuse. Ildith, however, convinces them to leave, hoping that they will someday understand their father and his greatness as a leader. Shuah goes only grudgingly, telling Lot that she hopes to see him suffering, as she does now that Astaroth is dead.
Immediately after the Hebrews and Sodomite slaves leave, God assails Sodom with earthquakes and lightning. Queen Bera retreats with her slave Orphea to her palace, where they are killed under the collapsing pillars. The Sodomites flee into the streets, still committing vile and selfish acts to save themselves or exploit the chaos, and are killed by collapsing buildings and fire.
Meanwhile, Ildith now wishes she were back in Sodom. Despite her love for Lot, she cannot accept his God, choosing to believe in Lot rather than in a Divine plan. Despite Lot's warnings, Ildith looks back at Sodom. God turns her into a pillar of salt just as He destroys the city with a final fiery explosion. Lot collapses in grief. Maleb and Shuah attempt to comfort Lot. Distraught, he staggers off with the Hebrews, who wander the desert once more.
