Alien Physiology

Alien Physiology
The Zerg (Starcraft) are a creature like alien race that eats other life forms to assimilate their essence.
Power/Ability to:	Use the traits of extraterrestrials.

"How blithely you use the word alien; you have no idea how alien a thing can be."

― The Dark Side of the Sun, Terry Pratchett

"This planet is the home to the largest mass of organic creatures ever seen. What breeds down in the pits of the planet is unknown and unrecognizable, but can be purchased for a low price at Woboo: Land O' Meat."

― Merchant on the planet Gyges. (Tyrian)

"I'm from outerspace, Jeff. I can do lots of cool shit."

― Roger (American Dad!)

Power to use the abilities of extraterrestrials. Variation of Cryptid Physiology.

Also Called

• Alien Form/Mimicry
• Extraterrestrial Form/Mimicry/Physiology

Capabilities

User with this ability either is or can transform into an extraterrestrial/alien: life forms that are of extraterrestrial origin. Given the near infinite variety of possible extraterrestrials, even only the ones in fiction, a user can conceivably use nearly any power.

Applications

• Gain the form of extraterrestrials from fables.
• Possess any special abilities of extraterrestrial creatures.

Common alien abilities

• Advanced Technology
• DNA Replication
• Energy Manipulation
• Empathy
• Enhanced Inventing
• Enhanced/Supernatural Condition
  • Enhanced/Supernatural Intelligence
• Environmental Adaptation
• Exotic Technology
• Flight
• Healing
• Hollow Skeleton
• Immortality
• Invulnerability
• Psionics
• Reactive Adaptation
• Shapeshifting
• Telekinesis
• Telepathy
• Teleportation
• Self-Sustenance
• Vacuum Adaptation

Variations

See the list of fictional extraterrestrials for further possibilities.

• Alien Animal Physiology
• Alien Dragon Physiology
• Alien Lord Physiology
• Alien Mage Physiology
• Alien Monster Physiology
• Angelic-Alien Physiology
• Atlantean Physiology
• Demonic-Alien Physiology
• Divine-Alien Physiology
• Extraterrestrial Machine Physiology
• Flatwoods Monster Physiology
• Grey Physiology
• Half-Alien Physiology
• Heavyworlder Physiology
• Lightworlder Physiology
• Martian Physiology
• Superior Alien Physiology
• Transcendent Alien Physiology
• Undead-Alien Physiology

Associations

• Alien Creation
• Alien Manipulation
• Alien Mind
• Alien Soul
• Alien Symbiosis
• Alien Weaponry Intuition
• Alienization
• Scifi Manipulation
• Superpowered Physiology

Limitations

• May need a specific environment to survive.
• Mimicked extraterrestrial may not possess human-level intelligence.

Known Users

See Also: Alien Tropes and Aliens Wiki.

Movies

• Alien Monsters (Godzilla/Unleashed)
• Aliens (Star Wars)
  • Twi'lek
  • Wookiee
  • Chiss
  • Hutt
  • Togruta
  • Mon Calamari
• Na'vi (Avatar)
• Palulukan (Avatar)
• Angtsìk (Avatar)
• Tetrapteron (Avatar)
• Viperwolf (Avatar)
• Fan Lizard (Avatar)
• Species (Species)
  • Sil
  • Eve
  • Patrick Ross
  • Sara
  • Miranda
  • Azura
  • Half-Breeds
• Paul (Paul film)
• E.T. (E.T. The Extra-Terrestrial)
• Engineers (Alien series)
• Xenomorphs (Alien series)
• Neomorphs (Alien Covenant)
• Taotie (The Great Wall)
• Yautja (Predator series)
• Peter Quill (Marvel Cinematic Universe)
• Drax (Marvel Cinematic Universe)
• Subject: 89P13/Rocket (Marvel Cinematic Universe)
• Gamora (Marvel Cinematic Universe)
• Groot (Marvel Cinematic Universe)
• Yondu Udonta (Marvel Cinematic Universe)
• Kraglin Obfonteri (Marvel Cinematic Universe)
• Rhomann Dey (Marvel Cinematic Universe)
• Garthan Saal (Marvel Cinematic Universe)
• Irani Rael (Marvel Cinematic Universe)
• Bereet (Marvel Cinematic Universe)
• Collector (Marvel Cinematic Universe)
• Ronan the Accuser (Marvel Cinematic Universe)
• Nebula (Marvel Cinematic Universe)
• Korath the Pursuer (Marvel Cinematic Universe)
• Thanos (Marvel Cinematic Universe)
• Outriders (Marvel Cinematic Universe)
• Aliens (Monsters vs. Aliens)
• Aliens (Megamind)
• becky Botsford/wordgirl (wordgirl)
• miss power (wordgirl)
• Warring Aliens (Monty Python's The Life of Brian)
• Aliens (Lilo & Stitch)
• Aliens (Treasure Planet)
• Aliens (Battle: Los Angeles)
• Aliens (The ChubbChubbs!)
  • Meeper
  • ChubbChubbs
• Calvin (Life 2017 film)
• Regents (Battleship)
• Philo (UHF)
• The Body Squeezers (Goosebumps)
• Psychlos (Battlefield Earth)
• Harvesters (Independence Day Series)
• Alien Beast (The Cabin in the Woods)
• Aliens (A Quiet Place)
• King Ghidorah (MonsterVerse)
• Bioraptors (Pitch Black)
• Aliens (Liquid Sky)
• Brandon Breyer/Brightburn (Brightburn)
• Formics (Ender's Game)
• Aliens (Valerian and the City of a Thousand Planets)
• D'Bari (X-Men: Dark Phoenix)

Live Television

• Aliens (Stargate franchise)
  • Asgard
  • Goa'uld
  • Unas
  • Wraith
• Gallifreyans (Doctor Who)
• Daleks (Doctor Who)
• Cybermans (Doctor Who)
• Weeping Angels (Doctor Who)
• Zygons (Doctor Who)
• Demogorgon (Stranger Things)
• Tenctonese (Alien Nation)
• Visitors (V)
• Aliens (Star Trek)
  • Klingon
  • Vulcan
• Cirronian (Tracker)
• Vardian (Tracker)
• Blancmange (Monty Python's Flying Circus)
• Pleskit (I Was a Sixth Grade Alien)
• Seijin (Ultraman)
• Ultras (Ultraman)
• Aliens (Freaky)
• Prince Yubi (Benji, Zax & the Alien Prince)
• Khyber (Benji, Zax & the Alien Prince)
• Darah (Benji, Zax & the Alien Prince)
• Coordinator Zang (Dani's House)
• Coordinator Zark (Dani's House)
• Grob (Pig's Breakfast)
• Meeba (Pig's Breakfast)
• Hoobs (The Hoobs)
• DottyWot (The WotsWots)
• SpottyWot (The WotsWots)

Cartoons

• Martians (Adventure Time)
• Warren Ampersand (Adventure Time)
• Aliens (The Adventures of Jimmy Neutron: Boy Genius)
• Aliens (Aliens Among Us)
• Aliens (Futurama)
• Roger (American Dad!)
• Aliens (Atomic Betty)
• Ben Tennyson (Ben 10 Series); via the Omnitrix/Ultimatrix
• Albedo (Ben 10 Series); via the Omnitrix/Ultimatrix
• Aliens (Ben 10 Series)
• Michael Jackson (Black Dynamite)
• Aliens (Buzz Lightyear of Star Command)
• Aliens (Cyberchase)
• Aliens (Dexter's Laboratory)
• Aliens (The Powerpuff Girls)
• Aliens (Duck Dodgers)
• Neptuna (The Hydronauts)
• Irkens (Invader Zim)
• Aliens (The Jetsons)
• Aliens (Lavender Castle)
• Aliens (Lloyd in Space)
• Yik Yak (Lunar Jim)
• Fluffies (Lunar Jim)
• Aliens (Miles from Tomorrowland)
• Astranova (Monster High)
• The Alien Eater (Monster Mash)
• Meap's species (Phineas and Ferb)
• Eliatrope (Wakfu)
• Aliens (Plasmo)
• Popo (Pororo the Little Penguin)
• Pipi (Pororo the Little Penguin)
• Aliens (Pororo the Little Penguin)
• KISSterians (Scooby-Doo! and KISS: Rock and Roll Mystery)
  • Starchild
  • Demon
  • Catman
  • Spaceman
• Kyle Broflovski/The Human Kite (South Park)
• Gems (Steven Universe)
• Aliens (Wander Over Yonder)
• Aliens (Vampires, Pirates & Aliens)
• Aliens (3Below: Tales of Arcadia)

Video Games

• Stella (Black Rock Shooter: The Game)
• Magnolia Arch (Bravely Second)
• Mantas (Unreal Series)
  • Cave Mantas (Unreal Series)
  • Giant Manta (Unreal: Return to Na Pali)
• Mercenaries (Unreal Series)
  • Mercenary Elites (Unreal Series)
• Ethereal (XCOM: Enemy Unknown/X-COM: UFO Defense)
• Sectoid (XCOM: Enemy Unknown/X-COM: UFO Defense)
• SOLDIERs (Compilation of Final Fantasy VII)
• Extraterrestrial Pokémon (Pokémon)
  • Deoxys
  • Ultra Beasts
  • Kyurem
• Zerg (Starcraft)
• Protoss (Starcraft)
• Akrids (Lost Planet)
• Draenai (Warcraft)
• Drakks (Unreal II: The Awakening)
• The Royal Four (Roswell)
• Aliens (Halo)
  • Sangheili
  • Unggoy
  • San'Shyuum
  • Jiralhanae
  • Forerunners
  • The Flood
• Yuki Nagato (The Melancholy of Haruhi Suzumiya)
• Infested marines (Starcraft II: Wings Of Liberty)
• Infested civilians (Starcraft II: Wings Of Liberty)
• Infested marines - spawn by Subterran.Unix (Storm of the Imperial Sanctum)
• Izariens (Unreal II: The Awakening)
• Jojo Achimu (Ninjutsu series)
• Kais (Unreal II: The Awakening)
• Kralls (Unreal Series)
• Aliens (Valkyrie Crusade)
  • Alien
  • Flatwoods
  • Alien Musse
• Aliens (Grand Theft Auto 5)
• Aliens (Hλlf-Life series)
• Celeste (Huniepop)
• Kirby (Kirby)
• Doomers (Kirby)
  • Grand Doomer
  • Sphere Dommers
• The Keepers (Prey)
• Titans (Unreal Series)
  • Stone Titans (Unreal: Return to Na Pali)
• Aliens (Sonic the Hedgehog)
• Skaarj Troopers (Unreal Series)
• Skaarj Warriors (Unreal Series)
• Sliths (Unreal Series)
• Brutes (Unreal Series)
• Tatanga (Super Mario Land)
• Tentacles (Unreal Series)
• Kyle Broflovski/Human Kite (South Park: The Fractured but Whole)
• Kyle Shwartz/Human Kite from an Alternate Universe (South Park: The Fractured but Whole)
• Toscs (Unreal II: The Awakening)
• Dhaos (Tales of Phantasia)
• Elves (Tales of Phantasia/Symphonia)
• Gasbags (Unreal Series)
• Alien Species (No Man's Sky)
• Endermites (Minecraft)
• Glacius (Killer Instinct)
• Samus Aran (Metroid)
• Aliens (Mass Effect)
  • Asari
  • Turian
  • Salarian
  • Krogan
  • Quarian
  • Angara
• The Aliens (NieR: Automata)
• Starcast (Skylanders: Imaginators)
• Mikakunin Tribe Member (Yo-kai Watch 4)
• Locust Horde (Gears of War)

Anime/Manga

• Vademon (Digimon)
• Vademon X (Digimon)
• Cyberdramon (Digimon)
• Aliens (Dragon Ball)
  • Saiyans
  • Namekians
  • Frieza's race
  • Shin-Jin/Core Person
  • Majins
• Mikitaka Hazekura (JoJo's Bizarre Adventure Part IV: Diamond is Unbreakable)
• Catians (Cat Planet Cuties)
• Amanto (Gintama)
  • Yato Clan
• Zentradi & Meltrandi (Macross)
• Protoculture (Macross)
• Ōtsutsuki Clan (Naruto)
• Keronians (Sgt. Frog)
• Devilukeans (To Love-Ru)
• Ctarl-Ctarl (Outlaw Star)
• Zeiram (Iria: Zeiram the Animation)
• Tsumugi Shiraui (Knights of Sidonia)
• Gauna (Knights of Sidonia)
• Incubators (Puella Magi Madoka Magica)
  • Kyubey
• Boros (One Punch Man)
• Delia (Stitch!)
• Aliens (Sonic X)
• Garmillas (Space Battleship Yamato)
• Aliens (Urusei Yatsura)
• Space Invader Monsters (Yu-Gi-Oh!)

Comics

• The Legion of Superheroes (DC Comics)
• Lantern Corps (DC Comics)
• Alien Races (DC Comics)
  • Oans
  • Martians
  • Tamaraneans
  • Thanagarians
  • Titians
  • Kryptonians
  • Daxamites
  • Braalians
  • Durlans
  • Dominators
  • Carggites
• Augustus Freeman/Icon (DC Comics)
• Mikaal Tomas/Starman (DC Comics)
• Mongul the First (DC Comics)
• Rac Shade, the Changing Man (DC Comics)
• Despero (DC Comics)
• Lobo (DC Comics)
• Atrocitus (DC Comics)
• Larfleeze (DC Comics)
• Wraith (DC Comics)
• Trolls (Homestuck)
• The Elders of the Universe (Marvel Comics)
• Alien Races (Marvel Comics)
  • The Kree
  • Skrulls
  • Titanians
  • Dire Wraiths
  • Badoons
  • Shi'ar
  • Techarchy
  • Chitauri
  • Majesdanian
  • The Brood
  • Klyntars; prior to parasitically copying power sets of others
• Hulkling (Marvel Comics); an offspring between a Skrull and a Kree
• Aliens (Teenage Mutant Ninja Turtles)
• Vampirella (Vampirella); original version only
• Composite Man (DC Comics)
• Allen the Alien (Image Comics)

Tabletop Games

• Eldar (Warhammer 40,000)
• Kroot (Warhammer 40,000)
• Necron (Warhammer 40,000)
• Orks (Warhammer 40,000)
• Tau (Warhammer 40,000)
• Tyranid (Warhammer 40,000)
• Vespid (Warhammer 40,000)

Music

• Ziltoid the Omniscient (Devin Townsend Project)
• The Blue Aliens (Eiffel 65); music video "Blue (Da Ba Dee)"
• The Guy (Disturbed); music video "Land of Confusion"

Other

• Count Jackula (Channel Awesome)
• Kalinin's SCP-001 Proposal - Past and Future (SCP Foundation)
• SCP-163 - An Old Castaway (SCP Foundation)
• SCP-975-2 - Subway Frogs (SCP Foundation)
• SCP-2020 - Cliche, Right? (SCP Foundation)
• SCP-2670-1 - Somebody Else's God (SCP Foundation)
• PringleTheOne (Planet Dolan)

Gallery

Movies

Xenomorphs (Alien franchise)

The Yautja/Predators (Predator franchise)

The Chitauri (Marvel Cinematic Universe)

Chewbacca (Star Wars), a Wookie

Gungans (Star Wars)

A female Twi'lek (Star Wars), a species known for its exotic beauty

Ashoka Tano (Star Wars), a Togruta

Jabba Desilijic Tiure (Star Wars), a Hutt

Superman (DC Extended Universe)

Aliens (Lilo & Stitch)

Stitch (Lilo & Stitch)

Gallaxhar (Monsters vs. Aliens)

Megamind (Megamind)

Minion (Megamind)

Metro Man (Megamind)

Na'vi (Avatar)

Paul (Paul 2011)

Brandon Breyer/Brightburn (Brightburn)

Live Television

The Royal Four (Roswell) have this ability due to their alien ancestry

Despite looking like a human, The Doctor (Doctor Who), is an alien called a Time Lord.

Martians or commonly known as Ice Warriors (Doctor Who)

The Asgard (Stargate franchise) were a benevolent, extremely advanced race from the Ida galaxy that visited Earth on many occasions. They used the cover of primitive gods in a similar manner to the Goa'uld, leading to the development of Nordic mythology.

The Goa'uld (Stargate Franchise) are a race of sentient parasitic beings that take over hosts.

The Wraith (Stargate Atlantis) are a vampiric hive-based species that harvest the 'life-force' of other humanoid beings for nourishment through suckers on their right hand palm.

Unas (Stargate SG-1) is a race named by the Goa'uld that translates to 'the first ones' or 'the first race' or more specifically, the first humanoid race that they used as hosts before Ra discovered Humans on Earth.

Cole/Daggon (Tracker) is a member of a species of energy-based extraterrestrials known as 'Cirronians'.

The Blancmange (Monty Python's Flying Circus) are a race of extraterrestrial, sentient blancmange that turn the UK's population Scottish so that they could win wimbledon.

Cartoons

Gwen Tennyson (Ben 10: Alien Force) is 3/4-human, 1/4 Anodite.

Michael Jackson (Black Dynamite) is a half-human, half-mamasemamasamamakusa hybrid with intentions of invasion for his father-race.

Ben's Transformations (Ben 10)

Thanks to the Omnitrix/Ultimatrix Ben Tennyson can become a variety of different aliens.

Zim (an Irken) and Gir (an alien robot) (Invader Zim)

Stitch (Lilo & Stitch) and his cousins are all aliens.

Coverton (Monsters vs. Aliens)

Sqweep (Monsters vs. Aliens)

Sta'abi (Monsters vs. Aliens)

Vornicarn (Monsters vs Aliens)

Leprechonians (Monsters vs Aliens) are a race of Leprechaun-like aliens that can manipulate probability, inducing good luck or bad luck on others.

Meap's species (Phineas and Ferb)

Lloyd Nebulon (Lloyd in Space), an erdigrian.

Aliens (Buzz Lightyear of Star Command)

KISSterians (Scooby-Doo! and KISS: Rock and Roll Mystery)

KISS (Scooby-Doo! and KISS: Rock and Roll Mystery)

Comics

The Legion of Super Heroes (DC Comics) is a 30th Century inter-galactic team of super-powered young adults. This cast expands to include dozens of members with a diverse array of powers and personalities.

Saturn Girl (DC Comics) hails from Saturn's moon Titan, where everyone is a naturally born telepath.

Garth Ranzz (DC Comics) also known as Lightning Lad or LiveWire hails from the planet Winath, where twin births are ubiquitous, accounting for almost all natives of the planet.

Cosmic Boy (DC Comics) hail from the planet Braal, where everyone has the natural power to manipulate magnetic fields

Lar Gand (DC Comics), better known as Valor or Mon-El is a Daxamite, the distance cousins of Kryptonians.

Star Boy (DC Comics)

Andromeda (DC Comics)

Shrinking Violet (DC Comics) hails from the planet Imsk, where everyone has the natural ability to shrink down to sub-atomic sizes.

Kal-El/Superman (DC Comics), a Kryptonian, is perhaps the most well-known alien today.

Kara-Zor El, Supergirl (DC Comics) the Girl of Steel is also a Kryptonian.

Power Girl (DC Comics), another female Kryptonian.

Kryptonians (DC Comics)

The Guardians of the Universe (DC Comics)

The Burning Martians (DC Comics) were the dominant life form on the planet Mars before being genetically altered by the Guardians of the Universe.

Green Martians (DC Comics)

White Martians (DC Comics)

J'onn J'onzz, the Martian Manhunter (DC Comics) Mars's greatest son.

Tamaraneans (DC Comics)

Blackfire (DC Comics)

Starfire (DC Comics) is an alien princess from the planet Tamaran with powers of flight and energy projection.

Daxamites (DC Comics)

Dominators (DC Comics)

Braalians (DC Comics)

Carggites (DC Comics) have the natural ability of Bio-Fission allowing the split their physical form into three independent bodies.

Kilowog (DC Comics) hailed from the planet Bolovax Vik, which was one of the most crowded worlds in the universe; it had sixteen billion residents with a communal mind.

Icon's (DC Comics) lifepod altered his DNA so he would resemble a normal human being, thus enabling him to blend among Earth's natives.

Mongul the Second (DC Comics)

Mikaal Tomas (DC Comics), better known as Starman.

The Sinestro Corps (DC Comics)

Atrocitus (DC Comics)

Skrulls (Marvel Comics)

Kl’rt, The Super Skrull (Marvel Comics)

A Badoon (Marvel Comics)

Dire Wraiths (Marvel Comics), a magical offshoot of Skrulls.

The Shi'ar (Marvel Comics)

The Shi'ar Imperial Guard (Marvel Comics)

Noh-Varr (Marvel Comics) a pink skinned Kree.

Techarchy (Marvel Comics), a techno-organic species.

Utrom (Teenage Mutant Ninja Turtles)

Triceratons (Teenage Mutant Ninja Turtles)

Eclipse the Darkling (Archie's Sonic the Hedgehog), a black arms alien.

Ceneca-10050 (Archie's Sonic the Hedgehog), a bem alien.

Composite Man (DC Comics)

Viltrumites (Image Comics)

In her original origin story, Vampirella (Vampirella) was a member of the Vampiri species, an alien race from the distant planet Drakulon with identical powers to the vampires of human mythology.

Allen the Alien (Image Comics)

Anime/Manga

Saiyans (Dragon Ball series), a race of extraterrestrials that are naturally aggressive warrior race who were supposedly striving to be the strongest in the universe,...

...Bardock, a low class warrior and father to both Raditz and Son Goku...

...Son Goku or Kakarot, a member of the low class of Saiyans...

...Raditz, the older brother of Son Goku and a member of the low class...

...Vegeta, Prince of all Saiyans and Nappa, a member of the mid class...

...Broly, a Saiyan mutant....

Kale (Dragon Ball Super), a Saiyan from a different universe.

Piccolo and Kami (Dragon Ball series) two Namekians

Frieza (Dragon Ball Z), in his numerous forms

Chilled (Dragon Ball: Episode of Bardock)

Catians (Cat Planet Cuties)

Kaguya Ōtsutsuki (Naruto)

Cosmo (Sonic X), one of her humanoid plant-like alien species.

Delia (Stitch!)

Mikitaka Hazekura (JoJo's Bizarre Adventure Part IV: Diamonds are Unbreakable), the Self-Proclaimed Alien of Morioh town.

RPG

Necrons (Warhammer 40,000)

Video Games

Magnolia Arch (Bravely Second)

Alien H.png

Alien (Valkyrie Crusade)

Alien Musse H.png

Alien Musse (Valkyrie Crusade) is an alien angel.

Flatwoods (Valkyrie Crusade)

Beat (Dragon Ball Heroes)

Note (Dragon Ball Heroes)

Froze (Dragon Ball Heroes)

Tsumuri (Dragon Ball Heroes)

SOLDIERs (Final Fantasy 7) are all infused with the cells of the extraterrestrial Jenova to further enhance their own physiology.

Archers (Hλlf-Life) are underwater creatures that can spit toxic substances.

Flocking Floaters (Hλlf-Life) are creatures of Xen that can levitate thanks to the gases that’s inside their pulsating heads, and can attack by releasing poisonous gases.

Kingpins (Hλlf-Life) have a massive brain which gives them psionic powers.

Panther Eyes (Hλlf-Life) have one single eye and are considered to be extremely predatory, being able to pounce on their prey and viciously bite and devour them.

Stukabats (Hλlf-Life) are Bat-like Aliens that can hide themselves on ceilings and some other open spaces.

Related to the Nihilanth, Alien Controllers (Hλlf-Life series) are Aliens that can float in the air, and have the powers to launch non-homing or homing energy balls.

Alien Grunts (Hλlf-Life series) are a group of Xen Aliens considered being stronger than Vortigaunts. They don’t exactly have the power to manipulate myriad energy at all, but instead, they use Hivehands, weapons that can spit out Hornets.

Barnacles (Hλlf-Life series) are creatures from Xen that attach to ceilings, and behavior-wise, they use their prehensile tongues to snatch unsuspecting prey to devour them.

Bullsquids (Hλlf-Life series) are Aliens that are the most signature predators to all Headcrabs. They can spit toxic saliva at their foes, and thanks to their razor-sharp teeth, their bite is so viciously powerful.

Gargantuas (Hλlf-Life series) are massive Aliens that can grow tough shells, which does make them into useful heavy infantry soldiers. Their fitness is also beyond natural, can generate streams of fire, and can stomp the ground to cause a unique kind of shockwave.

Headcrabs (Hλlf-Life series) are extraterrestrial parasites, though at least they tend to be for the sake of protecting themselves from greater predators. Thanks to having hidden beaks, they have a really strong bite, and they use them to graze through the human skull and take control of their nervous systems, turning them into Zombies.

Houndeyes (Hλlf-Life series) are dog-like Aliens that can release shockwaves made out of energy, and can also be empowered when a leader is present. The colors of the shockwaves usually change color depending on the amount of Houndeyes, going from white to violet.

Ichthyosaurs (Hλlf-Life series) are shark-like Aliens that roam inside the waters of Xen, and in terms of behavior, they are considered to be predatory like Sharks. They are fast swimmers, and trying to escape them is possibly doomed to fail. Thanks to having sharp teeth, they have an extremely powerful bite.

Snarks (Hλlf-Life series) are aggressive but small Xen Aliens. If there is only one Snark, they are ridiculously easy to kill, but once they form a herd, they will manage to kill their enemies in possibly seconds.

Like the rest of Xen’s inhabitants, the Tentacles (Hλlf-Life series) are extraterrestrial creatures that are found in the Borderworld. They are tall, and dangerously savage Aliens that can viciously attack anyone that happens to make sound within their vicinity.

Vortigaunts (Hλlf-Life series) were forced into aggressive slaves by the Nihilanth, but after his death, they became allies that have fought alongside the resistance against the Combine.

Race X (Hλlf-Life: Opposing Force) is an Alien race that can be considered rivals to the mainstream Xen Aliens. Their primary goal is to assimilate the entire world by force, which the Gene Worm is focused to do.

Hydras (Hλlf-Life 2) are commonly located and fought in the sewers. Each of their heads is shaped differently for different purposes, while the main head is used to pierce targets.

The Combine (Hλlf-Life 2 series) is a powerful extraterrestrial empire that had successfully taken over the planet Earth after the Black Mesa incident.

Black Arms (Sonic the Hedgehog)

Wisps (Sonic the Hedgehog)

Draenei (Warcraft) are a race of intergalactic beings that came to Azeroth to aid the Alliance.

The Protoss (Starcraft) are a race of Psion beings that have conquered many worlds with their vast technology.

An Asari (Mass Effect)

A female Turian (Mass Effect)

A Krogan (Mass Effect)

A "Leviathan" (Mass Effect), the oldest known intelligent race in the Milky Way.

A naked Sangheili (Halo)

A Jiralhanae (Halo)

A San'Shyuum (Halo)

A Mgalekgolo (Halo)

Deoxys (Pokémon), one of the few confirmed extraterrestrial Pokémon.

Several Ultra Beasts (Pokémon)

Other

Count Jackula (Channel Awesome) is a member of an alien race of horror-loving vampires from the Planet Dracula.