The Atlantis Corporation, a private military and security corporation, has initiated a secret research and development program known as "Project Necropolis". The goal of the project is to create a type of super-soldier to combat the Soviet Russians in the Cold War. After many failed human enhancement techniques such as cybernetic implants, brainwashing, genetic engineering and experimental drugs, the project appeared to be a failure. Doctor Gideon Reynolds, head of the project, manages to genetically engineer a virus/bacteria known as the "Green Flu", which reanimates the dead. Over the course of working on the project, Dr Reynolds begins to learn of the dark and twisted nature of the Atlantis Corporation, and eventually has to save the United States from a epidemic of Atlantis' creation.
Season 4 of The Virus Within
Trinity is familiar with zombies, being one herself, but when strange zombies start appearing, she realizes that the world she knew might be changing yet again.
When a dangerous set of scientific notes are discovered, Trinity and her friends don't realize anything is wrong until a frantic radio call comes in. Unaware of the notes, they race to the south and struggle to determine where the strange zombies came from. The zombies are unlike any ranks previously seen, and they aren't as predictable. Some have new tricks hidden up sleeves, forcing any Stronghold they encounter to quickly adapt to the new challenge or risk being overrun. Secrets never remain hidden, and zombie apocalypses never make life easy.