The episode covers the story of the Tuatha Dé Danann's invasion of Ireland, as documented in the Book of Invasions. It details how the Tuatha Dé, having learned magical arts in the northern islands, arrived in Ireland to confront the resident FirBolg people. The narrative describes diplomatic exchanges between the two groups, led by their respective champions Sreng (Firbolg) and Bres (Tuatha Dé), and the subsequent four-day Battle at Moytura. Key events include the Tuatha Dé Dé's arrival in magical mists, their initial offer to share the island, the Firbolg's refusal, and the eventual defeat of the Firbolg. The battle resulted in significant casualties on both sides, including the maiming of the Tuatha Dé king Nuada, who lost his arm. Amanda also discusses the historical and archaeological evidence for these events, including debates about the battle's location and the nature of the Tuatha Dé themselves - whether they were gods, Supernatural beings, or simply an advanced Bronze Age people.