A
replicant is a fictional bioengineered or
biorobotic android in the film
Blade Runner (1982). The Nexus series of replicants are virtually identical to an adult human, but have superior strength, agility, and variable intelligence depending on the model. Because of their similarity to humans, a replicant can only be detected by means of the fictional
Voight-Kampff test, in which emotional responses are provoked; replicants' responses differ from humans' responses. NEXUS 6 replicants also have an in-built fail-safe mechanism, namely a four year lifespan, to prevent them from developing empathic cognition and therefore immunity to a Voight-Kampff machine. A derogatory term for a replicant is "skin-job."