The "walking dead" have taken over the world. Only a small band of scientists and soldiers are definitely known to remain, and they have taken refuge in an underground missile silo. The only hope for survival of the human race hinges on discovering a way to either control the walking dead or get them back into their graves for good. Grotesque research experiments are being conducted by Dr. Logan, a borderline mad scientist, appropriately nicknamed Dr. Frankenstein by his associates. His most promising prospect for controlling the hordes of walking dead is one "guinea pig" zombie who seems to have a trace of humanity left in him. But the military leader soon discovers that some of his soldiers have been used as substitute guinea pigs in zombie experiments, and he retaliates by locking up the remaining scientific team with the zombies. Now, the remaining human survivors engage in a horrific last-ditch battle for life with thousands of the walking dead. The result is the darkest day of horror the world has ever known.