List of fictional alien species: M

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Name Source Type
M-113 Creature Star Trek
Macra Doctor Who Huge crustacoids who feed on noxious gases that are deadly to humans.
Magma Ultraman Leo Saber Tyrant
Magog Andromeda
Magolor Kirby's Return to Dream Land.
Mahendo'sat C. J. Cherryh's Chanur novels
Maians Perfect Dark
Majat C. J. Cherryh's Alliance-Union universe
Malons Star Trek
Mangalores The Fifth Element Thick-skinned humanoids; warriors and weapon specialists. Considered savage and brutish by other races.
Mantis Conquest: Frontier Wars
Mantrins Titan A.E. Kangaroo-like aliens with large, powerful back legs; native to Solbrecht. The character Stith is a Mantrin. Also called Sogowans.
Marklars South Park Orange-skined aliens with egg-shaped heads and yellow eyes. They refer to all people, places, and things as "Marklar".
Marmosians Ascendancy
Marro Heroscape Skinless creatures with insectoid social organization
Martians H. G. Wells' The War of the Worlds Tentacled and very intelligent and technologically advanced. Attempted to take over Earth as Mars became less and less habitable for them.
Martians Edgar Rice Burroughs's Barsoom series Humanoid
Martians Marvin the Martian from Looney Tunes and Duck Dodgers
Martians Premendra Mitra's Mangalbairi (The Martian Enemies)
Martians Ray Bradbury's The Martian Chronicles Humanoid
Martians Aelita (1924 movie) Humanoid
Martians Mars Attacks (Topps trading cards) and Mars Attacks! (Tim Burton movie) Skeletal humanoids with massive craniums and a twisted sense of humour
Martians Quatermass and the Pit
Martians Larry Niven's Known Space
Martian Manhunter DC Comics
Marzoids Invader Zim
Masari Universe at War A sentient race of ancient Atlantians that are human-like in appearance.
Masters The Tripods
Mazians Battlelords of the 23rd Century
Mebes Ascendancy
Mechanon Star Frontiers sentient mechanical race created by the Eorna
Medusans Star Trek
Meehooks Fusion comic book series dinosaurs with fur
Megawhatt Ben 10
Meekrob Invader Zim Pure energy beings. Meekrob was set to be conquered by Invader Tenn until she received a shipment of malfunctioning SIR Units giving away her location and thus angering the Meekrob, creating further tension between the Meekrob and the Irken Empire.
Meklars Master of Orion
Melconians Keith Laumer's Bolo series canine-like humanoids
Melmacians ALF
Melnorme Star Control
Melotians Melonpool
Memory Donk Bravest Warriors The Memory Donks are a species of "old-lady"-like beings that take away the memory of anyone around them.
Menoptra Doctor Who
Mentors Doctor Who
Merseians Technic History by Poul Anderson
Merewifs Bravest Warriors Merewifs are a race of mermaid-like creatures. Most notably, Plum
Mesklinites Hal Clement's Mission of Gravity millipede-like
Methorians Barrington J. Bayley's Zen Gun gaseous giant-giant dwellers
Metroid Metroid series
Metrons Star Trek
Micros Brain Plague by Joan Slonczewski Microbial aliens that inhabit the brain and offer their host new abilities.
Microman Microman
Micronoids X-Com: Apocalypse Sentient parasitic bacteria
Minbari Babylon 5 Crested humanoids; a small number have telepathic abilities
Minions Ascendancy
Minosians Star Trek
Mintakans Star Trek
Miradorn Star Trek
Misha Battlelords of the 23rd Century Humanoid
Mmrnmhrm Star Control
Mon Calamari Star Wars
Mondoshawan The Fifth Element Humanoid
Monoids Doctor Who
Mogadorians Lorien Legacies Humanoid, warlike race intent on destroying the Loric and invade Earth. Described as having very pale skin and dark hair and eyes.
Moon Dragons Bravest Warriors Moon Dragon toenails are used to make the Bravest Warriors' space suits.
Mooninites Aqua Teen Hunger Force (individually: Igninokt and Err) Pixelated-liked aliens
Mork Mork and Mindy
Morlocks H. G. Wells' The Time Machine
Morlocks Larry Niven's Known Space
Moroks Doctor Who Humanoid
Mor-Taxans War of the Worlds (TV series - first season)
Morthren War of the Worlds (TV series - second season)
Movellans Doctor Who Humanoid robotic conquerors; fought a war with the Daleks
Moxx of Balhoon Doctor Who Blue, large-headed humanoid
Mri C. J. Cherryh's Faded Sun trilogy Humanoid
Mr. Saturn EarthBound
Mrrshan Master of Orion
Mudokons Oddworld series
Muffalos RimWorld Sky blue creatures descended from buffaloes, as well as nearly identical to hornless versions of such.
Mugato Star Trek
Mutons X-COM: UFO Defense
Mutzachans Battlelords of the 23rd Century Humanoid
Muuh Orion's Arm
Mycon Star Control
The Mysterons Captain Scarlet and the Mysterons