某天，世界各地接连出现奇怪现象：安装心脏起搏器的病人突然暴亡、鸽子迷失方向四处乱撞、金门大桥断裂、罗马竞技场遭到密集雷电袭击……一时间，人类陷入前所未有的恐慌，似乎恐怖的世界末日就在眼前。各国政府及军队紧急动员，急切找到这一连串灾难发生的原因。在这关键时刻，地质物理学家乔许·凯斯（艾伦·艾克哈特 Aaron Eckhart 饰）探明真相，原来地核因某种未知的原因停止转动，导致磁场消失。为了拯救人类和地球，乔许以及蕾贝卡·柴德（希拉里·斯万克 Hilary Swank 饰）、罗伯特·艾维森（布鲁斯·格林伍德 Bruce Greenwood 饰）等专家组成一支救援小组，共同前往地球中心实行艰巨而充满危险的拯救任务。人类的命运命悬一线……

When Earth's magnetic poles begin reversing, David Terran, the only scientist who predited the possibility of such a sci-fi disaster, must join forces with his estranged friend and lover to save the world. Though his writings found mass readership, scientists scoffed at his theories. But when an Iranian underground nuclear test sets off a global phenomenon that matches David's doomsday scenario, he must attempt to find a solution in order to avoid a catastrophic event of global proportions. -dpeavy

The Office of Scientific Investigations tracks down the source of increased magnetism and radioactivity in Los Angeles, and discovers that a man-made isotope is consuming available energy from nearby mass every few hours, doubling its size in the process. Although microscopic, it will soon become big enough to destroy Earth; and how to stop it is yet to be determined. The film's Deltatron special effects footage is taken from the 1934 German sci-fi film GOLD.

Near a small English village, a scientific team is conducting experiments with magnetic fields, the results of which may have military applications but the intensification of which seem to be connected to UFO reports, a series of murders, an enormous insect egg, and a strange visitor with exceptional scientific knowledge.