When a contagious virus is accidentally unleashed in the UK, it soon cripples the entire country as it turns people into thoughtless rage monsters. Twenty-eight days after the outbreak, a group of survivors fights for their lives and try to find a way out of the ravaged London.
A virus spreads through Great Britain, and the U.S. Army manages to protect the survivors in a small London area, so that they can reproduce and repopulate. Six months later, an affected individual unknowingly brings it back, resulting in deadly chaos all over again.