The Bridge Between Servitude and Soul In the shadow-soaked world of Blade Runner , replicants evolved through generations: from the brute-force Nexus-1s to the emotionally volatile Nexus-6s (the fugitives hunted by Deckard), and finally to the docile, obedient Nexus-8s with implanted lifespans. But the Nexus-7 —often whispered as the “Rachel series”—was the forbidden leap.