A virus that locks those infected into a permanent state of killing
rage, is accidentally released from a British research facility. Carried by
animals and humans, the virus is impossible to contain, and spreads across
the entire planet. Twenty-eight days later, a small group of survivors are
trapped in London, caught in a desperate struggle to protect themselves from
the infected. As they attempt to salvage a future from the apocalypse, they
find that their most deadly enemy is not the virus, but other survivors."

Twenty-eight days later, a bicycle courier named Jim (Cillian Murphy)
awakens from a coma in a deserted hospital. Upon leaving, he discovers that
London has been completely abandoned and is rife with signs of catastrophe.
After taking refuge in a church, Jim is chased by zombie-like people, but is
rescued by two survivors, Selena (Naomie Harris) and Mark (Noah Huntley),
who rush him to their hideout in the London Underground. They tell Jim that
while he was comatose, a virus spread uncontrollably among the populace,
turning most people into mindless, blood-spewing monsters (referred to as
“the Infected”) and resulting in societal collapse, possibly on a global
scale.