IGN's Filmforce quotes the plot as so:
"Alice and Rain lead a team of commandos into "The Hive," a massive gene research facility, where a deadly virus has just broken out. The entire research staff was killed in seconds by the virus, but their bodies are reanimated and they become zombies. Alice has less than three hours to isolate the virus in the underground complex, or it could easily destroy all the human race. But soon it becomes clear that that team is threatened by more than just the zombies."