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 |
| Megawhatt | Ben 10 | |
| Meekrob | Invader Zim | Pure Enegy 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. |
| The Mooninites | Aqua Teen Hunger Force (individually: Igninokt and Err) | |
| 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 | |
| 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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