San Francisco lies under a cloud of radioactive dust.  The World War has killed millions, driving entire species to extinction and sending mankind off-planet. Those who remained coveted any living creature, and for people who couldn't afford one, companies built incredibly realistic fakes: horses, birds, cats, sheep... even humans.  Rick Deckard is an officially sanctioned bounty hunter tasked to find six rogue androids -- they're machines, but look, sound, and think like humans -- clever, and most of all, dangerous humans.