When Peter ends up in that long tunnel and endures a review of his life, he's slated to go to Paradise. Instead, the afterlife machinery reverses, spitting him out into a wasteland of scrub brush and darkness. Reduced to Stone Age technology, Peter and the last remaining humans struggle to survive against hellhounds and monster men. Beyond an uncrossable sea lies what appears to be a sunlit realm of fruit trees and birds, taunting them in their darkness and deprivation.