Although Fede Alvarez's upcoming Alien movie (tentatively titled Alien: Romulus) will not involve the Ellen Ripley character story arc or characters thereof, it will apparently take place within the same timeline, according to claims by our friends at Perfect Organism Podcast. Where exactly in the Alien timeline does Alien: Romulus fall? They claim it will take place between the events of Alien and Aliens. They also claim the film will not ignore events established in Ridley Scott's Alien prequels, Prometheus and Alien: Covenant.
To what extent the impact of the prequels will have on Romulus remains to be known entirely.
Regarding the timeline between Alien and Aliens, we know Ripley will have already blown up the Nostromo and remains in cryo stasis waiting to be picked up by the network during this time. It's possible the Nostromo incident is referenced in Alien: Romulus and could be what sparks an investigation by Weyland-Yutani which went unacknowledged in James Cameron's sequel Aliens - prior to the colony infection on LV-426. However without further details, we can only speculate for now.
As new details arrive, we'll keep you posted!
The Alien: Romulus sequel is currently in development and cameras are set to roll by October, 2025! Be sure to bookmark the Alien: Romulus 2 Info Page for an up-to-date account of all available information, production updates and important details!
In addition to the upcoming Alien: Romulus sequel, we have the Alien: Earth TV series from Noah Hawley now streaming and a rumoured Alien vs. Predator reboot in the works as well!

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