In the late 26th century, overpopulation on Earth is reaching the breaking point, and humanity must find new frontiers. The terraforming of Mars has taken centuries but is now complete. The colonization of Mars by humanity is an epoch-making event, but an unintended side effect of the terraforming process unleashes a horror no one could ever have imagined...

Mankind's final nightmare has become reality--the Terraformars have reached Earth! While the world's governments scramble to deal with the situation, humanity's best hope, the members of the Annex 1 expedition, are still trapped on Mars. Getting back to Earth is now not just humanity's only hope for survival, it's a race against time!