As for the Tyrell Corporation, it's probably an homage to the 1974 fictional television series The Night Stalker, where the "Mr R.I.N.G." episode features a violent genetic-mechanical hybrid android that develops a survival instinct. To avoid deactivation, the android escapes and collects artifacts and possessions, attempting to become more "human". The manufacturer of the android is the "Tyrell Institute."
Replicants are illegal on Earth after a bloody mutiny by Nexus-6s off-world. The Tyrell Corp. discovered that the longer a Nexus-6 lived the more life-experience it gained. With these memories they often developed unstable personalities so Tyrell added a "fail-safe device" to Nexus-6 models: a built-in four-year lifespan to prevent them from developing their own "emotional responses." This was especially necessary for Mental-A models whose intellectual capacity at least matched their genetic designers.
Special police units (Blade Runners) are sent to investigate, test and ultimately "retire" (kill) replicants found on Earth. Because the escaped replicants are the latest Nexus-6 generation Deckard had no experience with them, and wasn't even sure if the Voight-Kampff test would work given Holden was surprised by a Nexus-6.
Escaped replicants (all Nexus-6 Physical-A models):
Pris and Zhora's descriptions were mixed up in the film: Zora acts as a "basic pleasure model", attempting to pass off as a stripper, while Pris is capable of acrobatic combat moves which nearly kill Deckard.
Other replicants:
Tyrell developed Rachael as an experimental replicant with false memory implants, so she would think she was human. Tyrell said that these memories would act as a "pillow" to cushion her developing emotions. Normal replicants aren't very empathetic or "human" in character, and are emotionally unstable, largely because the experiences humans develop over decades they have to squeeze into four years. Thus, Leon who is only two years old is somewhat immature; while four year old Roy Batty who is feeling the effects of his impending death shows a range of emotions. Roy appears capable of love, guilt, sorrow, and empathy (although these emotions confuse him to a degree). In the end, Roy is something of a Blake-type character in the film, and almost a hero. He even saves Deckard's life, even though Deckard was sent to kill him.
The theatrical cut's voiceover ending said that as an experimental replicant Rachael didn't have the pre-determined four-year lifespan, but the Director's Cut left that ambiguous.
In Do Androids Dream of Electric Sheep? the Rosen Corporation simply did not know how to manufacture an android capable of living longer than four years.
Main article: _replicant_or_human.3F
There is a great deal of ambiguity fostered as to whether or not Deckard is a replicant. Blade Runner's dark paranoid atmosphere – and multiple versions of the film – adds fuel to the speculation and debate over this issue.
In the book, Rick Deckard (the main character) is at one point tricked into following an andy, who believes himself to be a police officer, to a faked police station. Deckard then escapes and "retires" some andys there before returning to his own police station. At that moment the reader is not entirely sure that Deckard himself is not an android, just like the other androids in the faked police station. However, Deckard takes the Voigt-Kampff (different spelling) test and it fails to indicate that he is an android.
Harrison Ford, who played Deckard in the film, has said that he did not think Deckard was a replicant. Director Ridley Scott is adamant that Deckard is a replicant.
This article is licensed under the GNU Free Documentation License.
It uses material from the
"Replicant".
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