In a flashback, Howard discovers Vault-Tec’s plan for nuclear war. In the present, Maximus fights Moldaver; Norm finds Vault 31’s sinister purpose. Lucy rejects her dad after learning his dark past.
Maximus saves Lucy from Vault 4 expulsion, stays as she escapes with Thaddeus’s help. They deceive Brotherhood with a fake head; Lucy escapes with the real one. Norm enters Vault 31.
Lucy and Maximus find refuge in Vault 4, where they learn of its odd cult worshipping Moldaver. Lucy investigates, gets captured. Flashback shows Howard’s Vault-Tec dilemma.
Maximus reveals identity, Thaddeus traps him and takes the head. Lucy frees Maximus; they seek Thaddeus, navigate Shady Sands, and fall into Vault 4. Betty becomes overseer.
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.
Maximus hides as Titus, Lucy fights a gulper, Howard kidnaps her. Maximus and Thaddeus retrieve the head, and Vault 33 debates raider fate.
Dr. Wilzig develops a substance, flees with his dog CX404, and later dies to help Lucy reach Moldaver. Maximus betrays Titus; Howard uses CX404 to track Lucy.
In 2077, Cooper Howard survives a nuclear attack as a Ghoul. In 2296, Lucy MacLean defies Vault 33 to find her kidnapped father, while Brotherhood hunts an Enclave member.
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