At their core, most of the Alien movies are about corporate greed. The lengths a company, mainly Weyland-Yutani, will go to harness and exploit a power from the deepest reaches of space. Whether that means sacrificing a whole ship of employees,

Marking the last movie starring Sigourney Weaver as the franchise's main lead Ripley, "Alien: Resurrection" is a disappointing attempt to expand the franchise. You can't ignore the star's disinterest in coming back to play a cloned version of her character or Winona Ryder looking so out of place as the new addition.

Alien: Earth has been expanding the franchise lore about mechanical beings, but Alien: Covenant reveals some key history.