When a boy falls down an air shaft in Nebraska, Iron Man flys down the hole to save him. Below, he discovers an underground city guarded by an artificial intelligence, Survival Environment Remote Vanguard and Control, S.E.R.V.A.C., who has been entrusted with preserving the most important artifacts of the civilization destroyed by the Great Cataclysm above. Iron Man attempts to convince the computer that the cataclysm never took place, but it refuses to accept the truth.