For Rootmars in slug version, see Rootmars (Vehicle).

Rootmars is the leader of the Martians and the mastermind behind the alien invasion in Metal Slug 2. It is also the primary antagonist in Metal Slug 3.


Metal Slug 2

Rootmars plotted the invasion of Earth. The Martians backed up the Rebel Army with technology and resources to fight against the Regular Army. However, the Rebels were merely a tool to them, and the Martians were planning on allowing the Rebels and the Regular Army to weaken each other, then use this as an advantage to conquer the world.

Metal Slug 3

After the Martians failed in their last attempt, they took on a new approach: abducting General Morden and sending a
Rootmars Connected Artwork

Rootmars aboard the Rugname

martian disguised as him to lead the Rebels and start a new coup d'état, causing numerous supernatural phenomena throughout the world. As the martians were unmasked, they kidnapped one of the Regular Army commandos and made their escape, immediately pursued by the rebels and the Regular Army. Their ship Rugname was invaded and Rootmars, who was controlling the ship using its brainpower, was put out of commission, thus triggering the self destruction of the ship. As the heroes made their escape from the self-destructing ship, Rootmars made a last attempt to kill them, but was ultimately defeated and he sank to the bottom of the sea.

Metal Slug 6

As Rootmars lay dormant under the sea, the Martians were left defenseless against their natural predators, the Invaders, who took the opportunity to conquer both the Martians and Earth. With the help of the Rebel Army, the Martians rescued Rootmars and after some misunderstanding, allied themselves with the Regular Army to counter the Invaders. If the player rides Rootmars in the 4th mission, then it — instead of Morden — will appear to rescue the players at the end of the final mission.

Metal Slug 7

While Rootmars doesn't make an appearance, some Martians are seen rescuing Morden and his army. This shows that the Martians are once again allies to the Rebel Army.

Metal Slug Defense

Rootmars Unit Details described as Rootmars joined in Regular Army to fight against The Martians. It is possible as Rootmars was betrayed by Martians, after his former subordinate joined the alliance with Invaders. Because in a faction unit bonus system in Metal Slug Defense, the Martians and the Invader factions are the same faction.

Metal Slug Attack

On the Extra Ops: Aliens vs. Morden, there is a side-story which depicts that Rootmars' brain got corrupted (or likely brainwashed) by the Invaders, which caused it to attack any ally Rebels or Martians... As Morden made his plan to restore Rootmars' brainwashed self, with the help of the Martians. They made a plan to destroy any Invaders trying to corrupt his brain, in order to restore its old self.


Rootmars, also known as "The Motherbrain of Marspeople", has never been shown with any kind of distinct "personality", but it is said that its desire is to take over the Earth and vanquish everything.

The encounter with the Invaders shows that Rootmars is rational enough to be willing to co-operate with a former enemy if a greater threat presents itself. This also suggests a dedication toward its own race's welfare.

In Metal Slug Attack, Rootmars is shown to be much more mellow, accepting the Professor into the Martian Army after he proves his worth to it. It also has a desire to protect the Earth from those that would harm it.


In Metal Slug 3, during the Final Mission in the Rugname, the first encounters is a giant Martian, complete with tentacles, connected to the ship's core via large cables into its brain. It has several stitches running from its "chin" to the ring of cables, intended to mark some sort of surgery-like procedure when the cables were attached to its brain. Later on that form was revealed to be a "Fake" Rootmars on Metal Slug Attack. The real one is encountered at end of the game's final mission, it appears as the mothership self-destructs, it having a pair of large clawed arms reminiscent of a Tyrannosaurus rex (instead of tentacles) and a mouth that can spit acid. Its brain is its weak spot, just like the "Fake" counterpart.


See also the Rootmars (Vehicle)

Heroes Marco Rossi | Tarma Roving | Eri Kasamoto | Fio Germi | Trevor Spacey | Nadia Cassel | Ralf Jones | Clark Still | Leona Heidern | Walter Ryan | Tyra Elson | Roberto Nicola | Nathalie Neo | Alisa Stewart | Hero | Gimlet | Red Eye | Tequila | Amir | Whip (Seirah)
Support Hyakutaro Ichimonji | Rumi Aikawa | Madoka Aikawa | Utan | Navel | Issenman Tarou | Eris | Hyakumantaro | Heidern
Villains Donald Morden | Allen O'Neil | Abul Abbas | Rootmars | Amadeus | Evil Spirit Incarnate | Ptolemaios | Invader Queen | Allen Jr. | Oguma | Macba | Lt. Wired | Kanan | Hilde Garn | Unknown Alien
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Metal Slug Tetsuyuki | Hairbuster Riberts | Tani Oh | Shoe & Karn | Iron Nokana | Hi-Do

Mini-Bata | Allen O'Neil

Metal Slug 2/X The Keesi II / Iron Nokana MK II (X) | Aeshi Nero | Dragon Nosuke | Big Shiee | Hozmi | Rugname

Mosque Artillery | The Keesi II (X) | Allen O'Neil | Dai-Manji

Metal Slug 3 Huge Hermit | The Ten Commandments of Moses | Jupiter King | Sol Dae Rokker | Rootmars

Twin Ohumein-Conga | Monoeyes | Hairbuster Riberts | Hi-Do | Rugname | Fake Rootmars

Metal Slug 4 Brave Guerrier | Toschka Dalanue | The Iron | Big John | Sea Satan | Amadeus Mother Computer

Mecha Allen O'Neil

Metal Slug 5 Metal Rear | Shooting Ray | Wall Crawler | Sand Marine | Evil Spirit Incarnate

Black Hound | Stone Turtle (unused) | Mammoth Tower | Ptolemaios (unused)

Metal Slug 6 Bull Drill | Iron Sentinel | Brain Robot | Sea Worm | Invader Queen

Invader Controller

Metal Slug 7/XX Worm Mecha | Crablops | Destroyed Crablops | Fall Mecha | The Union | Rebel Gigant | Kraken

Scrap Tower | Big Gate

Metal Slug: 1st Mission Rebel VTOL | Rebel Train | Macba | Rebel Zeppelin | Electromagnetic Crane | Weapons Port Boss | Hilde Garn

Facility Elevator | Macba | Rebel Truck

Metal Slug: 2nd Mission Big Bertha | Terrain Carrier | Rebel Reactor | Macba | Rebel Submarine | Tani Oh | Wired | Rebel Airplane | Hilde Garn's Slug | Rocket UFO

Power Generators | Rebel Rocket | Hyakutaro

Metal Slug Advance Formor | Emain Macha | Kaladgolg | The Keesi III | Cabracan

Allen Jr.

Metal Slug 3D M-3 Rocket Launch Support Van | Mosque Artillery | Spider-Bot | Underground Cruise Missile | Morden's Battleship | Morden's Castle | Allen O'Neil | Lugus | Lieu
Metal Slug Attack Pharaoh's Arc | Ptolemaios | Ball Slug | Great Mother | K-O3 Coupled Armored Vehicle | Land Blowfish | Cyclobster | Slug Square | Zoni Doloma | Quadro Jumper | Fortmeranian
Mobile games Rocket Control Room | Unknown Alien | Hellfire | Spiderbot | Cyclops | Mega Laser Turret | Mars Battle UFO | M-32 Water Carrier Plane | Kourai | Alien Floating Structure
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