A replicant is a fictional bioengineered humanoid featured in the 1982 film Blade Runner and the 2017 sequel Blade Runner 2049 which is physically indistinguishable from an adult human and often possesses superhuman strength and intelligence. A replicant can be detected by means of the fictional Voight-Kampff test in which emotional responses are provoked; a replicant's nonverbal responses differ from those of a human. Failing the test leads to execution, which is euphemistically referred to as "retiring".
Several models of replicant were produced. The first seen model, the Nexus-6, has a four-year lifespan. The successor model, the Nexus-7, were limited experimental models with the ability to procreate. Nexus-8 and Nexus-9 replicants also have open-ended lifespans, but the Nexus-9 line was incapable of disobeying human orders.