Alien 5 Saga Franchise

Currently, there are 4 (four) complete movies films with sequels in the Alien saga franchise:

Alien (1979)

Aliens (1986)

Alien 3 Three iii (1992)

Alien 4 iv Four Resurrection (1997)

Director Ridley Scott is planning to return to the Alien movie film series by creating the next chapter called Alien 5 v Five prequel

There have also been two spin off Alien films movies involving a war with the Predator extraterrestrial alien species:

Alien vs Predator (Alien Versus Predator) 1 One i (2004)

Alien vs Predator Requiem (Alien Versus Predator) 2 ii Two (2007)

It is unknown if there will be further Alien vs Predator sequels in the form of Alien versus Predator 3 Three iii