 The film received mostly favorable reviews, with Smith's performance being singled out for praise; criticism focused on its divergences from the novel, particularly the ending.In 2009, a genetically re-engineered measles virus, originally created as a cure for cancer, turns lethal.The virus kills 90% (5.4 billion out of 6 billion) of the world's population and turns 9.8% (588 million) into vampiric albino zombie like cannibalistic mutants called Darkseekers, who are extremely vulnerable to the ultraviolet rays in sunlight.