Patrolling the ruins of a post-apocalyptic wasteland, squad captain Cole makes a startling discovery that overturns everything survivors believe about the ongoing biological disaster. The lethal plague does not spread through animal bites, but descends directly from the clouds as a toxic gray downpour. Before Cole can warn the civilian enclaves, he discovers an even darker threat lurking inside the sanctuary: Director Thor is using displaced survivors as non-consensual test subjects to synthesize a mutated human species. Trapped between poisonous skies and an immoral laboratory, Cole awakens a rare dual-element superpower within himself, preparing to dismantle Thor's tyrannical research and secure the future of the human race.