When Wilzig's head is snatched by a monster, Lucy and The Ghoul try to retrieve it. Meanwhile, Thaddeus unknowingly teams up with Maximus, and dynamics shift in Vault 33.
Lucy and The Ghoul encounter dangerous situations, leading to a moral dilemma and intense confrontations. Norm uncovers secrets in Vault 32, linking back to his mother's past and raising questions about the residents' fate.
Lucy joins forces with Maximus to find Thaddeus, who absconded with the head. Meanwhile, Betty becomes the overseer of Vault 33 and reassigns part of the population to Vault 32.
Lucy and Maximus learn about Vault's 4 refugee policy and uncover unsettling secrets. Meanwhile, the Ghoul has flashbacks to his former life, where he learned of his wife's role in a Vault-Tec conspiracy.
Residents of Vault 4 prepare to expel Lucy for breaching the forbidden Level 12; Thaddeus finds a means to heal his foot; Norm infiltrates Vault 31; Moldaver convinces Howard to distrust his wife.
Two hundred years have passed since the beginning of the apocalypse. Leaving the atomic shelter that protected them will pave the way to an unknown world that will unleash a war for survival.
