Alien in order

A science fiction horror film franchise, focusing on Lieutenant Ellen Ripley (Sigourney Weaver) and her battle with an extraterrestrial life-form, commonly referred to as "the Alien". Produced by 20th Century Fox, the series started with the 1979 film Alien, then Aliens in 1986, Alien³ in 1992, and Alien: Resurrection in 1997. 4 films, 7h 57m in all, in release order.

1. 1
   

   Alien

   1979 · 117 min

   During its return to the earth, commercial spaceship Nostromo intercepts a distress signal from a distant planet. When a three-member team of the crew discovers a chamber containing thousands of eggs on the planet, a creature inside one of the eggs attacks an explorer. The entire crew is unaware of the impending nightmare set to descend upon them when the alien parasite planted inside its unfortunate host is birthed.

   Absolute Cinema
2. 2
   

   Aliens

   1986 · 137 min

   Ripley, the sole survivor of the Nostromo's deadly encounter with the monstrous Alien, returns to Earth after drifting through space in hypersleep for 57 years. Although her story is initially met with skepticism, she agrees to accompany a team of Colonial Marines back to LV-426.

   Absolute Cinema
3. 3
   

   Alien³

   1992 · 114 min

   After escaping with Newt and Hicks from the alien planet, Ripley crash lands on Fiorina 161, a prison planet and host to a correctional facility. Unfortunately, although Newt and Hicks do not survive the crash, a more unwelcome visitor does. The prison does not allow weapons of any kind, and with aid being a long time away, the prisoners must simply survive in any way they can.

   Popcorn Flick
4. 4
   

   Alien Resurrection

   1997 · 109 min

   Two hundred years after Lt. Ripley died, a group of scientists clone her, hoping to breed the ultimate weapon. But the new Ripley is full of surprises … as are the new aliens. Ripley must team with a band of smugglers to keep the creatures from reaching Earth.

   Popcorn Flick