Set in a post-apocalyptic future as survivors of a deadly virus try to adapt. Reynolds, a high strung professor, and Sonya, his tough-minded assistant, fight to find a cure and take in a naive teen, Angela, who recently lost her father. Jim, a tough guy commando, and Eric, a scrawny movie quoting warrior, battle outlanders, gangs and infected while trying to salvage anything along the way. Frank, an honest G.I., and Derek, a ruthless soldier, are sent on a mission that tests their morals.