Any replicants that should be on earth are considered illegal and subject to execution.
Since replicants looked like humans, a special eye-test is created to sort real humans from replicants, called a VOIDCOMP. Question are asked to the person being tested in order to provoke .
emotions, which many replicants lacked. The Tyrell Corporation did not create the replicants with emotions, knowing that they would eventually develop their own feelings.
Among the six replicants that escaped to earth are Roy Batty, Zhora, Pris, and Leon. Each one is designed differently to do different tasks. Roy Batty is a combat model and the leader of the escapees. Zhora, is referred to as "Beauty and the Beast," because she is an exotic dancer and also trained for an off-world murder squad. Pris is made for military and pleasure purposes and Leon is also a combat model designed to kill. All are models of a Nexus 6.
A different kind of replicant, Rachel is a a new design of a Nexus. She is different from the rest because she was built without a termination date and was implanted with emotions. She had no idea she was a replicant because childhood memories were implanted in her head. All the memories she had were from Tyrell's niece. .
Despite Blade Runner's thin plot line, the scenery and special affects are ones to remember. "Unimaginable skyscrapers tower over streets that are clattered with humanity; around the skirts of the billion-dollar towers, the city at ground level looks like a third-world bazaar," says Roger Ebert in his review of the movie. He is correct in saying that on the ground the city is very dark and dreary and over-populated with advertisements and oceans of people. Entertainment Weekly also agrees about the picture of Los Angeles,"The opening shot is a hellishly beautiful vision of the twenty-first century Los Angeles, casting druggy, hypnotic spells.".
Throughout Blade Runner Deckard, Harrison Ford, hunts down the trespassing replicants on earth and destroys each of them.