One of the most confusing chapters in the Alien franchise, Prometheus, has a similarly confusing ending, but its importance to Ridley Scott's sci-fi horror series means an explanation is in order. Since it's one of the first Alien movies chronologically, Prometheus is absolutely brimming with lore and information about the xenomorphs and their origins. Alongside that lore, however, are multiple layers of symbolism, subtext, and hinted-at pieces of information. That's part of the reason Prometheus is considered one of the most confusing Alien movies in the whole franchise. The ending of Prometheus, however, can be explained, and its information sheds new light on the entire series.

Every Alien movie has contributed to the wealth of knowledge about xenomorphs, from the warriors introduced in Aliens to the offspring from Alien: Romulus. With the new types of xenomorphs, Alien movies also reveal more about how they're created, from facehuggers to chemical compounds and more.