

Rick Deckard, a former blade runner, is called out of retirement when four known replicants, most combat models, have made their way back to Earth, with their leader being Roy Batty.

It's now November, 2019 in Los Angeles, California. Police units, called "blade runners", have the job of destroying - or in their parlance "retiring" - any replicant that makes its way back to or created on Earth, with anyone convicted of aiding or assisting a replicant being sentenced to death. When the superhuman generation Nexus 6 replicants, used for dangerous off-Earth endeavors, began a mutiny on an off-Earth colony, replicants became illegal on Earth.

In the early twenty-first century, the Tyrell Corporation, during what was called the Nexus phase, developed robots, called "replicants", that were supposed to aid society, the replicants which looked and acted like humans. A blade runner must pursue and terminate four replicants who stole a ship in space, and have returned to Earth to find their creator.
