In Blade Runner, the Nexus series of replicants – genetically engineered by the Tyrell Corporation – are virtually identical to an adult human being, but have superior strength, agility, a wider temperature range tolerance, and variable intelligence depending on the model. In the film, the character Chew is revealed as the Tyrell Corporation employee who designed the eyes for Nexus-6 replicants Roy and Leon. They both hunt him down and demand to know how to enter Tyrell's inner sanctum.