A war has started, to be more specific, World War 3.
Everyone is panicking and choosing sides in the matter.
Meanwhile an organization has built an underground bunker for people to stay, while the war rages above their heads.
The bunker would provide the people with food, water, medical services, education and more.
But the bunker was only for those who were asked, due to a certain professions, or those who could pay a lot of money.
The news of the bunker spread over the globe and soon most all the people that had the money traveled to the United States, one way or another, and were sent down into the bunker.
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.