List of fictional alien species: M
| 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 | |
| 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. | |
| Moonflowers | Hanazuki: Full of Treasures | Childlike creatures with Mood plumes resembling flowers, they live on moons that don't orbit planets. | |
| 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 |
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