Alien(1979) -

As the crew attempts to hunt the creature, they realize it is growing at an impossible rate, transforming into an eight-foot-tall apex predator with concentrated acid for blood. One by one, the crew members are picked off:

Back on the Nostromo , Ripley attempts to enforce a 24-hour quarantine to prevent the creature from coming aboard. However, Ash violates protocol and opens the airlock, allowing the team and the specimen inside. Alien(1979)

is snatched while searching for the ship's cat, Jonesy. As the crew attempts to hunt the creature,

They haven't reached home; instead, Mother has intercepted a mysterious transmission from a nearby moon, Acheron (LV-426). Bound by company protocol, they are forced to investigate. Jonesy. They haven't reached home