Xenomorphs are a dangerous alien species that Superman has encountered numerous times in the past. A young girl named Kara also grew up on Argo City, a colony threatened by the creatures. (Superman/Aliens)
Behind the Scenes
Xenomorphs, known more commonly as Aliens, are from the Alien film series. However, they have had numerous crossovers into the DC Universe, fighting not only Superman but also Batman and Green Lantern. They fight the Predators in the Alien vs. Predator film series, and this also makes its way into DC Comics.