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Zombie fluid, Mutation rifle, Syringe
First game
Last game
ZombiedoctorSurvivor4Cientifico-AsustadoCientifico-Corriendo-RifleCientifico-EsperandoScientist turning into monkey

The Scientists are minor characters common throughout the Metal Slug series, often seen performing different roles throughout the course of various sequels.


Scientists pose no threat in general, and are considered as to a logical extent, freelancers, as they just perform specific tasks and duties assigned to them by some higher authority or organization. Their roles in different sequels vary; they are classified as NPCs in Metal Slug 2, all the while as enemies in the case of Metal Slug 4. It is important to note that scientists in Metal Slug 3 possess both roles: as NPCs, they are investigators and researchers of a mysterious meteor crash site, and as enemies (lest they are targeted), zombies who have been mercilessly succumbed to the strange element emanating from what is revealed to be from The Ten Commandments of Moses, which is otherwise at the center of the aforementioned crash site.


Metal Slug 2 / Metal Slug X


Dead corpses of scientists are seen throughout the sewers of New Godokin City, having been massacred by mutated soldiers as a result of a backfire experienced during their experiments with the aforementioned soldiers beforehand. What may have caused the backfired experiment in question and the fate of the scientists prior to the incident are never revealed, although it is possible that they were the only personnel inside the hideout upon receiving reports of infiltration of the rebels' hideout at that time before the situation had gone haywire.

Metal Slug 3


Sent on a mission to investigate a meteor crash site, the scientists soon bear witness - and fall victim - to the apocalyptic cataclysm of The Ten Commandments of Moses' ability to turn every living human within the proximity of its influx into zombies. Upon the arrival of the player, a handful of scientists who have managed to escape the horror happening right ahead of them are seen running away from the outbreak, while those less fortunate can be found deeper in as the player progresses throughout the area, either as targeted survivors or newly-turned zombies.

In Metal Slug Defense, Zombie Scientist are cheap units that do not appear to have any attacks or abilities, but instead, release bodily fluids upon being damaged. This retaliation shot is able to fire up to long range and is surprisingly powerful. Ironically, since it can only attack after being damaged, when confronted by an enemy sandbag they will simply gather before it unable to advance or attack it and are then easily dispatched with a good explosive attack

Metal Slug 4

Cientifico-Corriendo-RifleCientifico-EsperandoScientist turning into monkey

This time, working for the Amadeus Syndicate, as defenders of the Amadeus Wireframe Base by default, they helped the syndicate members in their efforts. When the Regular Army stormed in however, their iron-helm morale swiftly faltered with ease as one by one they were left to the mercy of the Regular Army's might. Scientists in this sequel are seen with a rifle capable of altering a human's cellular properties, turning them into monkeys. What is very ironic is that with the right reflexes, they can also experience the same misfortune as well.

In Metal Slug Defense, Amadeus Scientists are cheap unit. Like the zombies, their rifle can't transform an enemy into monkey. This fact makes the Scientist act like the rifleman unit as well. If the Amadeus Scientists were killed, they will instantly transformed into monkeys and disappear.


  • Zombie scientists in Metal Slug 3 is easy to kill. When you kill the Zombie scientists, A First-aid kits which cures the player from the zombie status are always dropped by them upon death.
    • The zombie scientist, on a logical basis, superficially resembles zombies from other works of zombie fiction the most, if one takes note of his shambling movements.
    • His leg movement is somewhat strange, attributing to his realistic shambling walk.
    • Apart from the heavily-mutilated zombie, his physical appearance seems to be very grotesque among the rest of the zombies; his clothing also sports blood as well, despite not having such as a human beforehand.
  • In Metal Slug 4, if the player is close enough, a scientist will attempt to use what appears to be an oversized syringe to inject the chemical. If he fails, he will accidentally inject himself and into a monkey. He could be pick up as an item, netting the player 1000 points.
    • The scientist's ability to turn people into chimps are based on Charles Darwin's theory of evolution which says that humans and chimps share a common ancestry, and have similar DNA.
  • While the scientist's true intentions and motives are unknown in all organizations they are seen in (with the exception of Metal Slug 3), it may have been so for two reasons: either they were in pursuit of fame and fortune within the organizations in question, or they were kidnapped or taken captive and were forced to do research on behalf of the factions they serve, only to have their experiments used for nefarious purposes.
  • The scientists are also one of the characters in the Metal Slug series to retain their appearances from one sequel to another.
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 | Gimlet | Red Eye | Tequilla
Support Hyakutaro | Rumi Aikawa | Madoka Aikawa | Utan | Issenman Tarou | Eris
Villains Donald Morden | Allen O'Neil | Abul Abbas | Rootmars | Amadeus | Evil Spirit Incarnate | Ptolemaios | Invader Queen | Allen Jr. | Oguma | Macba | Hilde Garn | Unknown Alien
Instructors Sophia | Margaret | Lilly | Mary | Cynthia
NPC POWs | Parker | Satiko Suzuki | Scott Amundsen Jr. | Miner | Genie of Lamp | Orca | President | Sailor | Rebel NCO
Cameos KOF Team | Battle Cats
Unused Achilles | Tabomba | Ptolemaios
MSA Newcomers Scotia Amundsen | Pharaoh | Red Goblin | El Dorado | Professor | Dragunov | MS-Alice | Abigail | Vatn | Yoshino | Odette | Beatriz | Caroline | Cleopatra | Vita | Annette | Jin
Human Rebel Infantry | Arabian Infantry | Division 6 | Pirates | Scientists | Ptolemaic Infantry | Natives | Hunters | Future Rebels
Undead Mummies (Mummy Generator) | Dog Mummy | Mutated Soldiers | Zombies | Tar Man | Clones
Mutant Bat | Chowmein-Conga | Ohumein-Conga | Enormous Moray | Jellyfish | Flying Killer | Man Eater | Huge Locust | Sasquatch | Maggot | Big Snail | Giant Caterpillar | Squid | Huge Ivy
Alien Monoeye | Ring Laser Mecha | Hopper Mecha | Mars Mecha | Mars People | Big Eye | UFO | Mini-UFO | Invader Squad | Winged Invader | Flying Parasite | Hunter Walker | Hunter Lord | Scavenger | Crab-Tank | Vanguard | Smasher | Invader UFO | Indestructible UFO | Flying Core

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