Metal Slug Wiki
Leader Rootmars
Commanders Professor
Mars People Neo (Marty)
Mars People Rangers (Elite Officers)
Founded Unknown
Headquarters Rugname
Area of Operations A base somewhere on Earth
Enemies With Regular Army and Rebel Army (Metal Slug 2 & Metal Slug 3)

(Metal Slug 6)

Affiliated With Regular Army and Rebel Army (Metal Slug 6)
(Metal Slug Defense; Rebellion)
Rugname (w Manji).gif

Mini - U.F.O (mejorado).gif

The Martians are the most recurrent alien enemy of the Metal Slug series. Led by the giant Rootmars, they are extremely intelligent beings and mainly communicate through telepathy, even though it was shown they are able to speak. Their main goal is to conquer the Earth and subjugate humanity in order to save the planet from being depleted of its resources. To reach this objective they have often tried to weaken Earth's military forces through various schemes. They betrayed and manipulated numerous factions, (mainly the Rebels) before trying to invade.

Several humans have joined the Martians. The Martians do not mind human allies for their cause, as they provide them with various equipment and even allow them to command units.


Martians are psychic based alien lifeforms with a clear hierarchical structure and a generally benevolent nature. They however severely despise and eradicate inferior races that deplete their home planets resources and wellbeing. Their technology heavily relies on energy manipulation and genetic/biological engineering together with necromancy. Methods of reproduction are unclear.

Metal Slug 2

The Rebel Army was supported by the Martians but unbeknownst to them, the Martians were only planning to weaken the Earth's military. Revealing their involvement and true intentions at the end of the Final Mission, the Martians betrayed the Rebel Army and abducted Morden. The Rebel Army and the Regular Army allied briefly against the alien menace to rescue the general.

Metal Slug X

Their role in this game is the same as in Metal Slug 2 except this time around the protagonists come in contact with the Martians as early as the fourth mission.

Metal Slug 3

The Martians captured Morden again early on, replacing him with a doppelganger who is revealed at the rocket site. Therefore, the rebels allied momentarily with the Regular Army once the ruse is exposed by protagonists.

Metal Slug 6

The Rebel Army allied with the Martians again after events of MS3, however, another alien race named the Invaders attacks the Martians and the humans worldwide in the midst of the battle. A triple alliance is formed with the Rebel Army and the Regular army in order to destroy the Invaders' nest and put an end to the new threat.

Metal Slug 7/XX

In the game's credits, they are seen saving Morden after he is apprehended by the Regular Army. The Martians also make a return as fightable enemies in Metal Slug XX. This could be showing that they allied themselves with the Rebel Army, along with the Future Rebels.

Metal Slug Defense

In the game's 1.19.0 patch, Rootmars was betrayed by some of his people and requested help from the Regular Army to fight against the rebelling Martians, who had sided themselves with the Invaders.

Metal Slug Attack

It is revealed that Rootmars traveled back to Mars to recover, and left behind a small Martian base, which is currently run by the Neo-Martian Marty and the Professor. Due to the Professor's views on humanity, the Martians clash with almost every faction, though they tend to battle the Rebel Army the most.

Despite the physical weakness of the Martians, the Professor has worked hard to help the Martian cause, creating new equipment and lifeforms. Most of their attacks are laser based, making them significantly dangerous against conventional equipment.


Martians are all almost identical in appearance. They are differentiated by their psychic abilities and the color of their skin. In Metal Slug 6, most of their names are in syllables starting with "P", although the Professor in Metal Slug Attack proclaims none of them have names.


Mars People: The most common troop of the Martian Army.
Mars people (cafe).gif
Mars People Cabre: Brown-tanned Martians are assault troops carrying stronger Spore Pistols.
Mars people (blanco).gif
Mars People Elite: White Martians also known as Captains are elite soldiers and commanding officers.
Mars People Officer: Green Martians are the most elite ones. They are capable of distorting space-time with their psionic powers in order to call in artillery strikes directly from Fake Rootmars. They first appear in Metal Slug Attack.
Mars General COO.gif
Mars People Chief Operating Officer: Dark Red Martians are top ranking officers also in charge of current affairs. They have stronger versions of the Officers' attacks. They compose the Martians' high command and first appear in Metal Slug Attack.
Neo Mars move.gif
Mars People Neo: A significantly stronger mutated purple Martian who Rootmars bestowed his power upon. Only one Neo exists: the Earth's expeditionary Martian forces second-in-command who the Professor calls "Marty", since he was annoyed with the fact that the Martians lacked proper names.

Mars People Rangers

A trio of previously common Martians given weapons created by the Professor and overseen by Clone Betty.

MSAUnit Mars People Tank.png
Mars People Tank: A Martian equipped with a shield created by the Professor to block incoming attacks. It's the "leader" of the group.
MSAUnit Mars People Attacker.png
Mars People Attacker: A Martian equipped with a ray gun created by the Professor that shoots both spores and lasers.
MSAUnit Mars People Healer.png
Mars People Healer: A Martian equipped with a healing staff created by the Professor to heal the wounds of its allies. It's the most timid Martian in the group.

Units of the Martian Army




Neo Mars shoot.gifMars General COO.gif

Mars People Rangers

MSAUnit Mars People Attacker.pngMSAUnit Mars People Tank.pngMSAUnit Mars People Healer.png

  • Mars People Attacker
  • Mars People Defender
  • Mars People Healer

Enhanced Super Soldiers

CloneMarcoIdle.gifClone Abby MSA idle.gifClone Betty MSA idle.gif


Mars people (disparando).gif

Monoeye.gifDark Monoeye MSA idle.gif


Professor MSA win.gifPercier MSA win2.gifBonnyIdle.gif

  • Professor "Aionion" (Mars head scientist, previously human, defected from the Rebels)
  • Percier (Professor's Assistant, defected from the Rebels)
  • Ariadna (Enhanced Soldier, defected from the Rebels)
  • Halle (Radio Operator)
  • Bonny (Mars People friend)
  • Harriot (Defected from the Rebels)
  • Pauline (Defected from the Ptolemaics)
  • Leone (Defected from the Rebels)
  • Clario (Alien ally)
  • Unsigned (Necromantic research ally)
  • Raubtier (rescued Invader)


Combat Drones

Hopper Mecha: Suicide drones which attack in large swarms.
Mars Walker: Large quadropod walkers that attack by dropping explosive bubble from under its body.
Ring Laser Mecha--.gif
Utom: Brain controlled robot units. Fires ring lasers in all directions.

Aircrafts and Spacecrafts

Bigeye1.gifBigeye2.gif Tiny UFO: Armed surveillance drones.
Mars Satellite: Unmanned UFO-like satellite.
Miniufo.gifMini - U.F.O (mejorado).gif Mini-UFO: Main Martian Attack Aircrafts for close air support.
Dai Manji: Armed spacecraft carrier. Uses various heavy energy-based weapons and deploys troops and Mini-UFOs.


Ultimate war machines of the Martian army, able to threaten entire civilizations by themselves.

MSA Mars Gigantalos.png
Mars Gigantalos: Martian Battle Mecha.
Mars Battle UFO by Banden.png
Mars Battle UFO: Martian Elite Heavy Attack Spacecraft.
Metal Fusioner N.223: Weaponized Biological Organism.
Monoeye UFO: Landing beacon protected by a zombification energy and Monoeyes.
MSA Psionic Brain.png
Psionic Brain: Psychic biological organism that functions as a clone control tower.
Rugname: Martian Flagship. Used for planetary invasions, they sport a laser big enough to vaporize cities.


A gray Martian who had taken General Morden's appearance

  • The Martians are based on old 1950's B-movie flicks and some alien movie flicks.
  • The primary Martians seen are based heavily off of the Martians found in the H.G. Wells novel The War of the Worlds.
  • The look of the Martian UFO's are based on a design by famed UFOlogist George Adamski, who claimed to have witnessed it firsthand. This style is one of the most iconic of the UFOlogy field and has appeared in many Japanese science Fiction movies and animation.
  • Mars People have also appeared in the fighting games Neo Geo Battle Coliseum and SVC Chaos: SNK vs. Capcom. Their fighting moves have been named after paranormal folklore like the Tunguska Blast of 1909 and the 1947 Roswell incident.
  • Death animations yield some information about their physiology. They have an inner skeleton (basically just one large skull) and a small mouth. Official artwork shows they also have teeth. They spew green blood. When severed, their tentacles will spasm momentarily, which implies a nervous system.
  • The Metal Slug 2 ending is based off the ending for the Independence Day film (1996) where Russel Casse flies his aircraft into the core of the mothership, charging up for a final attack, causing a chain reaction destroying the flagship.
Regular Army P.F. SquadS.P.A.R.R.O.W.SIkari WarriorsMetal Device Project
Rebel Army Rebel InfantryArabian InfantryFuture RebelsACEBlaze Brigade • "Frozen Brigade"
Large Scale MartiansAmadeus SyndicatePtolemaic ArmyInvadersOguma Corporation
Small Scale Japonese Army (Division 6) • PiratesKOF TeamMummy ArmyRed Goblin SocietySecret SectVampires • "World Military Corp." • Yuki Tsuki Hana
Mixed Space ArmyEastAnother ForceDesert ArmyRevolution Army