Name Source Type M-113 Creature Star Trek Macra Doctor Who Huge crustacoids who feed on noxious gases that are deadly to humans. Magic Man Adventure Time Martian; after magic seem to have been transferred to Betty, Simon's fiancée, he turned Magic Man into "Normal Man". 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 Mantis Man Adventure Time: Distant Lands Mantrins Titan A.E. Kangaroo -like aliens with large, powerful back legs; native to Solbrecht. The character Stith is a Mantrin. Also called Sogowans. Margles Adventure Time Martian; once Magic Man's wife Marklars South Park Orange-skinned 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 Adventure Time 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 Marvelous Man The Guardians of Justice Alien superhero; parody of Superman Marvin Marvin Marvin 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 seriesdinosaurs 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 A creature that, in its infancy, resembles a jellyfish-like creature capable of siphoning the life force of other creatures, using this to kill them. As it grows, it undergoes two metamorphoses, the first one making it similar to an arthropod, and the second one making it resemble a quadrupedal theropod dinosaur. They were created by the Chozo to be used as weapons against the more dangerous X parasite. Metrons Star Trek Mewmans Star vs. the Forces of Evil 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 Miu Miu-miu My Lover from the Planet Meow Cat-like humanoid Mmrnmhrm Star Control Mnemonoid Adventure Time Only in comic version Mon Calamari Star Wars Mondoshawan The Fifth Element Humanoid Monoids [ broken anchor ] 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 Morok [ broken anchor ] 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 [ broken anchor ] 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 Mukadil Paejua Vampire Idol Vampire-humanoids Mutons X-COM: UFO Defense Mother Parasite Zoochosis Mutzachans Battlelords of the 23rd Century Humanoid Muuh Orion's Arm Mycon Star Control The Mysterons Captain Scarlet and the Mysterons