Alien

or are creatures descended from the outer space, not originated from Earth.
:Main article: Arthropodian
:Main article: Cylien
:Main article: Energy being
:Main article: Grey
:Main article: Little green men
:Main article: Martian
:Main article: Mastermind
:Main article: Nordic
:Main article: Predator
:Main article: Reptilian
:Main articles: Space Monsters (species) & Xenorian
:Main article: Zeta Reticulans
Category:Creatures
Category:Aliens