Prometheus is one of the most important entries in the Alien series, exploring the origins of both the Xenomorphs and humanity's mysterious creators, the " Engineers ." In addition to this lore-building, however, Ridley Scott's film is notable for verifying a further link between the Alien saga and Scott's other sci-fi franchise, Blade Runner , in a remarkable way you'd likely not expect.
The connection between Alien and Blade Runner has long been established in both franchises, dating as far back as to Aliens , when Dallas was shown to have previously worked for the Tyrell Corporation. Nevertheless, Prometheus goes a step further by confirming not only a shared universe, but a close relationship between the founders of both the Tyrell Corporation and Weyland-Yuta