Located in Japan, the Middle Asian Network for Global Activities is the sister organization for S.H.I.R.T.S. They are associates and allies to S.H.I.R.T.S., or at least usually.

Inhabitants of the Land of the Mangaboos. They are not made of meat, but are instead vegetables.

An animal race that Superman helped set free from their slavery on planet Trillia.

The Maniaks are a Scooby Doo-like band of teenagers that go around solving crimes.

In Kingdom Come, conclave of villians who support violent heros to force the war between humans and superhumans.

The Mannites are a group of children genetically engineered by the US government to have superpowers. The most prominent Mannite is Nina, who assisted Charles Xavier in regaining his powers after Onslaught.

There was once only a single race of 'Serpent Beings'. Then, for reasons unknown they split into two factions: the snake-headed Serpent-Man, and the Man-Serpents; huge snakes with the mask-like human faces, and venomous little serpents for hair. Under the command of Thoth-Amon, for a time, they warred with the Serpent-Men who were ruled by Thulsa Doom. Eventually both came to serve the wizard from Stygia.

The Manta-Men are Black Manta's henchmen.

An army of swamp monsters at the command of Jennifer Kale.

A creature from Persian mythology, its Persian name is Martyaxwar which means man-eater.

The native peoples of New Zealand.

Hostile beings who travel the multiverse seeking planets to devour and obliterate whenever incursions between realities take place.

Organization responsible for the creation of the Elephantmen under the leasership of Dr Kazushi Nikken

A group of mercenaries whose members dress in high-tech army ant suits. The Marabunta acquire their illegal firearms through the sale of illegal diamonds.

The Marauders are most well known as a group of henchmen for Mr Sinister, assembled by Gambit. They are responsible for the slaughter of the Morlocks. The name has also been co-opted by Kitty Pryde for her X-Men squad, charged with protecting the Krakoan gates around the world.

Marchand Pharmaceutical is a research corporation, formerly owned and administrated by Michael Marchand.

Personification of nightmares in Scandinavian folklore.

An organization which funds the Avengers.

Aliens in the Ratchet and Clank universe with purple skin and elf-ears.

A crime family in Gotham.

Rebels against the Intergalactic Empire of Wakanda of fights to restore the nameless.

M.A.R.S. Industries is a weapons manufacturer owned and operated by Destro.

Traditionally martians are small green humanoids.

Martians are a green skinned alien race that have shape shifting powers. Shapesmith and Martian Man are both examples of Martians who have come to Earth and operated as susperheroes with their powers.

Originally an unstoppable force that almost succeeded in wiping out humanity they are famous for being defeated by the common cold, a virus that while relatively harmless to humans seems to be fatal to the Martians.

Powerful robots used by the Marvanites/Monitors to power their ships.

Alien race dedicated to improving the cultures of the universe--or destroying their worlds if they are not up to the Monitors' standards.

The Marvel Bullpen is the nickname that is used for the staff and creators who work at the Marvel Comics offices.

The extended "family" of Captain Marvel, which includes the Captain himself, his sister Mary (Mary Marvel) and his best friend Freddy Freeman (Captain Marvel, Jr.). All three members share similar costumes, powers and abilities.

An unnamed group of "street-level" superheroes formed by Daredevil.

A superhero team that consisted of Marvelman and his two sidekicks, Kid Marvelman and Young Marvelman.

From the mid to late 1950s through to the early 1960s, Marvel wasn't about men in tights. It was about MONSTERS!

In an alternate universe, there lives the Marvel Werewolves.

The heroes and villains of Earth-2149 who were tragically turned into zombies. They have all but destroyed their own reality.

Based on the cartoon series and Kenner toyline, the series features vehicles that transform into other vehicle types (like a car becoming a plane).

A group of super-villains with elemental powers. They are longtime enemies of the Outsiders

The Masters of Evil is the name of various groups of super villains and their motive is usually to defeat or humiliate the Avengers. Leaders have included both Baron Zemos, Ultron, the Mandarin, Klaw, Doctor Octopus, Egghead, the Crimson Cowl, Machinesmith, Whirlwind, the Hood, Jonas Harrow, Max Fury and Lightmaster.

The name the members of the CIRCUS OF CRIME went by when The Clown unseated Ringmaster as leader of the outfit. Fought Spider-Man.

A group of high-tech assassins that honor the samurai code and are hired to eliminate Tony Stark.

Protectors of the planet Yann.

The Masters of the Night, are, in the Italian comic book "Dampyr", a powerful race of extradimensional beings with vampire-like abilities. They came to Earth using an ancient and lost technology, after the demise of their home world.

The greatesr fighters of Eternia formed a team to battle against Skeletor's army, The Evil Horde and The Snake Men.

Mushroom/humanoid hybrid creatures.