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Aliens or extraterrestrials are creatures descended from the outer space, not originated from Earth.

Sub-species

Arthropodians

Main article: Arthropodian

Cyliens

Main article: Cylien

Energy beings

Main article: Energy being

Grays

Main article: Grey

Little green men

Main article: Little green men

Martians

Main article: Martian

Masterminds

Main article: Mastermind

Nordics

Main article: Nordic

Predators

Main article: Predator

Reptilians

Main article: Reptilian

Space monsters and Xenorians

Main articles: Space Monsters (species) & Xenorian

Zeta Reticulans

Main article: Zeta Reticulans
Races
Terran BeastHumanMutantUndead (GhostSkeletonZombie)
Aliens ArthropodianCylienEnergy beingGreyLittle green menMartianMastermindNordicPredatorReptilianSpace monster (Xenorian) • Zeta Reticulan
Other AnthropoidCryptidHumanoidHybridInsectoidMonsterRobot (AndroidCyborg)