Alien Movies: Ripley Saga
The complete journey of Ellen Ripley (Sigourney Weaver), one of cinema's famous action heroes and the heart of the Alien franchise. This order follows Ripley's entire character arc from her first terrifying encounter with the xenomorph as a warrant officer through her evolution into humanity's greatest defender against the alien threat.
Experience Ripley's transformation from sole survivor to fierce warrior to tragic hero across nearly two decades of storytelling, witnessing how each encounter with the xenomorphs changes her while she fights against both the creatures and the corporate forces that would exploit them.
There are 3 other watch orders available - see the links up above.

Alien
The crew of a commercial spaceship encounters a deadly alien creature that stalks them through their vessel after being brought aboard from a distant planet. This sci-fi horror classic follows their desperate fight for survival against a nearly indestructible extraterrestrial predator.
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Aliens
Ripley, the sole survivor of a deadly alien encounter, reluctantly joins a team of Colonial Marines to return to the planet where the nightmare began. This intense sci-fi sequel delivers relentless action as humanity faces an even greater xenomorph threat.
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Alien³
Ripley crash-lands on a prison planet where she must face a deadly alien threat alongside hardened convicts, with no weapons and no way to escape.
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Alien Resurrection
Two hundred years after her death, Ripley is cloned by scientists hoping to breed the ultimate alien weapon, but both she and the new creatures prove full of deadly surprises. The resurrected Ripley must team up with smugglers to prevent the aliens from reaching Earth.
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Other Film Series
Darkman
Sam Raimi's cult superhero-horror trilogy following a disfigured scientist who becomes a vigilante.
Phantasm
A surreal horror franchise following young Mike Pearson and ice cream vendor Reggie in their ongoing battle against the interdimensional Tall Man and his deadly silver spheres.
Resident Evil
Live-action film adaptations of the popular survival horror video game series, featuring two distinct storylines across seven films.
Romero's Living Dead
George A. Romero's groundbreaking zombie saga, featuring classic horror films and several reboots.
Scanners
A sci-fi horror series about people with telepathic and telekinetic abilities, beginning with David Cronenberg's acclaimed 1981 film.
The Purge
A dystopian horror franchise set in an America where all crime is legal for 12 hours once a year during an annual event called The Purge.