Nero's suicide in 68 AD leaves Rome without an heir, and the empire spends a year tearing itself apart as rival generals fight for the throne. Vespasian, commanding legions against Jewish rebels in Judaea, marches on Rome instead, and the film follows the roughly 50,000 deaths in the resulting civil war before turning to his siege of Jerusalem in 70 AD, where the temple burns with the rebels inside. Vespasian's building program, including the first work on the Colosseum, brings a period of confidence that his death and the eruption of Vesuvius in 79 AD cut short. Pliny the Younger threads through both catastrophes: his uncle dies commanding the fleet at Pompeii, and Pliny himself later serves as adviser to the tyrant Domitian and then to Trajan. The film closes with Trajan, a Spanish-born general chosen by consensus rather than combat, expanding the empire to its largest territorial extent while running tax relief and child welfare programs. The episode traces four emperors and one volcano across roughly three decades.