At their core, most of the Alien movies are about corporate greed. The lengths a company, mainly Weyland-Yutani, will go to harness and exploit a power from the deepest reaches of space. Whether that means sacrificing a whole ship of employees, a platoon of soldiers, families, criminals, or cloning dead people, almost every story in the Alien saga is about the idea that getting an alien back to Earth would be a huge benefit to the bottom line of the company.
This, of course, never comes to be. In Alien , the xenomorph aboard the Nostromo killed almost everyone on the ship before being blown into space. The story of Alien: Romulus then hinges on the remains of that alien being captured, exploited, and causing another ship to be decimated. Aliens features a plan to sne