Tir na nOg, the Celtic Otherworld whose name means land of the young, is far stranger and more dangerous than the sanitized fairy-tale version. This episode goes to the ancient texts to explore the home of the Tuatha De Danann, where immortality is sustained by the Feast of Goibniu and entry requires passing through burial mounds, mystical mist, deep water, or a three-day sea voyage along the golden Plain of Honey.

Four stories anchor the discussion: Oisin's three years with Niamh that turn out to be three hundred, and his instant aging when his feet touch mortal ground; a paranoid Otherworld king who curses his daughter with a pig's head to avoid losing a foot race for the throne; King Cormac's journey through the mist to a silver house where a pig will only roast when four truths are told and a cup shatters on lies; and Diarmuid's three-d ...