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Bosses are enemies that always appear at the end of a mission. The player is forced to eliminate it in order to advance through the game. Bosses are always hard to kill and are mostly supported by other basic troops.

This is a list of bosses found in the Metal Slug game series.

Metal Slug

Mission 1

  • Tetsuyuki (Improvised fortification constructed from a crashed Type 770 Takatsu-class aerial gunboat/bomber)

Mission 2

Mission 3

  • Allen O'Neil (Immortal elite soldier from the Rebel Army; mini-boss)
  • Tani Oh (Giant self-propelled artillery armed with andro cannons)

Mission 4

  • Shoe & Karn (Cooperative mission tanks designed to cover each other's backs, acting in tandem)

Mission 5

  • Iron Nokana (Multi-role combat vehicle designed primarily to hold up large troop movements)

Final Mission

Metal Slug 2

Mission 1

Mission 2

  • Aeshi Nero (Giant subterranean excavator, basically a huge robot snake with a hypercharged andro cannon in its mouth)

Mission 3

  • Dragon Nosuke (Platformed urban tank used to defend vulnerable trains with a variety of weaponry)

Mission 4

  • Big Shiee ("Amphibious vehicle of destruction", basically a naval battleship on tracks)

Mission 5

  • Hozmi (Covert operation submarine built by the rebels using supplied Martian technology)

Final Mission

  • Allen O'Neil (mini-boss)
  • Dai-Manji (UFO armed with energy bombs and an electric beam projector; sub-boss)
  • Rugname (Martian mothership which has an underside port for a Dai-Manji to dock onto, hypercharging it's electric beam into a lethal laser)

Metal Slug X

The bosses of Metal Slug X are mostly the same as Metal Slug 2, but with some changes.

Mission 1

  • Iron Nokana MK II (Multi-role combat vehicle designed primarily to hold up large troop movements)

Mission 3

  • The Keesi (VTOL heavy bomber, a combined bomber and troop transport; mini-boss)

Metal Slug 3

Mission 1

  • Twin Ohumein-Conga (only in the underwater route, these brown variants possess heavy armor and shoot acid-bubbles that float upwards; mini-boss)
  • Huge Hermit (Giant hermit crab whose current shell used to be a large tank)

Mission 2

  • Monoeyes (Six alien guardians; sub-boss)
  • Monoeye UFO (Alien artifact used by the Martians for a first strike, which defends itself by starting off a zombie plague among people near it)

Mission 3

  • Jupiter King (Giant nuclear-powered robot which defends the rebels' underwater weapons factory)

Mission 4

Final Mission

  • Hairbuster Riberts (The same aircraft from the first game but controlled by Allen O'Neil; mini-boss)
  • Hi-Do (The same attack helicopter from the first game but controlled by a Mars Person in disguise; mini-boss)
  • Rugname (Martian mothership: the player fights three Dai-Manjis beforehand; mini-boss)
  • Fake Rootmars (A caricature of Rootmars connected to the Rugname; mini-boss)
  • Rootmars (Leader of the Mars People, who looks like a huge martian head with an exposed brain)

Metal Slug 4

Mission 1

Mission 2

  • Toschka Dalanue (Pillbox tower "Toschka Dalanue" controlled by Allen O'Neil)

Mission 3

  • The Iron (Improved multi-role combat vehicle "Iron" controlled by Donald Morden)

Mission 4

  • Big John (Giant machine doll converted by the Amadeus syndicate to carry zombie and mummy plagues)

Mission 5

  • Sea Satan (Submarine "Sea Satan" assisted by a destroyed Brave Guerrier)

Final Mission

Metal Slug 5

Mission 1

  • Black Hound (Auto-piloted, Ptolemaic enhanced version of the Metal Slug; secret mini-boss)
  • Metal Rear (Ptolemaic Ultra-giant Metal Slug: Unit #04 "Metal Rear")

Mission 2

  • Shooting Ray (Ptolemaic Large-sized aerial aircraft carrier: Unit #03 "F-502 Shooting Ray")

Mission 3

  • Screamer (Ptolemaic wall crawling unit: Unit #01 "Screamer")

Mission 4

  • Sand Marine (Ptolemaic amphibious assault landing ship: Unit #02 "Sand Marine")

Final Mission

  • Mammoth Tower (Ptolemaic tower with two robotic elephant heads controlled by two cultists; sub-boss)
  • Avatar of Evil (Giant scythe-wielding demon)

Metal Slug 6

Mission 1

Mission 2

  • Iron Sentinel (Large rocket launching tank that slides the downhill controlled by Donald Morden)

Mission 3

  • Brain Robot (Invader robot controlled by a giant brain)

Mission 4

Final Mission

Metal Slug 7

Mission 1

  • Scrap Tower (Small tower made out of garbage protecting the entrance to the Rebel base; mini-boss)
  • Worm Mecha (Giant worm-like drill machine controlled by Donald Morden)

Mission 2

Mission 3

  • Destroyed Crablops (The same robot from Mission 2 but this time its legs are separated from its head)

Mission 4

  • Fall Mecha (Giant gorilla-like robot that climbs the waterfall)

Mission 5

  • The Union (Vehicle that can separate in three independent parts)

Mission 6

Final Mission

  • Big Gate (Time portal that transports Future Rebel troops and weapons to the present; mini-boss)
  • Kraken (Giant octopus-like robot controlled by Donald Morden)

Metal Slug Advance

Mission 1

  • Formor (Rebel version of the metal slug tanks, twice as big and has same weapons)

Mission 2

Mission 3

  • Kaladgolg (Basically the Tani Oh on a railway flatcar and not a giant tank)

Mission 4

  • The Keesi III (An improved version of The Keesi II from Metal Slug 2)

Final Mission

  • Allen Jr. (Son of Allen O'Neil from the Rebel Army; optional mini-boss)
  • Cabracan (Powerful device that can make earthquakes)

Metal Slug: 1st Mission

Mission 0 (Emergency Mobilization)

  • Rebel VTOL (A hovering Rebel aircraft that fires with its Vulcans)

Mission 3 (Battle in the City)

Mission 6 (Penetration of the Front Base)

  • Macba (Lieutenant Colonel who fights with knives)

Mission 10 (Night Flight)

Mission 12 (Weapons Dump)

Mission 14 (Weapons Port)

Mission 16 (Fierce Battle)

  • Facility Elevator (Similar to the Electromagnetic Crane, expect the blocks contain enemies and the conveyor belts are missing).
  • Macba
  • Rebel Truck (Armored Rebel vehicle that slowly inches to the player)
  • Hilde Garn (The commander of the PHANTOM Squad riding his personalized Slug)

Metal Slug: 2nd Mission

Mission 1 (The Front Line)

  • Big Bertha (Large cannon stationed on a Rebel train)

Missions 8 and 10 (War-Torn City and Terrain Carrier)

Missions 14 and 15 (Reckless Reactor and Into the Fray)

  • Rebel Reactor (Large reactor with security on the sides and a Gatling gun in the middle)

Mission 18 (Pursuit)

  • Hyakutaro (Prisoner who challenges the player to a fight; secret mini-boss)
  • Macba

Mission 20 (The Enemy Below)

  • Rebel Submarine (Aquatic vehicle that fights in the bottom of the sea)

Missions 23 and 24 (The Tundra King and The Ice Queen)

  • Tani Oh (Rebel tank that fires landmines and a laser)

Mission 26 (Decoy Strategy)

  • Lt. Wired (Phantom Squad's second-in-command who dual-wields guns and tosses grenades)

Mission 31 (The Fortress)

Mission 32 (Ocean Depths)

  • Rebel Submarine (Aquatic vehicle fighting the Slug Sub)

Mission 34 (The Stronghold)

  • Power Generators (Three contraptions that fight similar to the Rebel VTOL; mini-boss)

Mission 35 (Menace Out of the Skies)

  • Rebel Airplane (Rebel aircraft fighting the Slug Flyer)

Mission 37 (Lone Assault)

  • Macba (Found on a specific route in the trolley section; secret mini-boss)
  • Hilde Garn's Slug (A reconstructed boss without the titular owner)

Mission 38 (Termination)

  • Rebel Rocket (Three phase fight with the main Rebel weapon; mini-boss)
  • Rocket UFO (Rocket's top fighting with homing missiles and a claw; main boss)
  • Kanan (Commander of the PHANTOM Squad and the construction of the Rebel Rocket. Uses his rifle as his last resort; final phase)

Metal Slug Attack

Mummy's

  • Pharaoh's Arc (A large chariot ridden by the Pharaoh and controlled by various mummies

Ptolemaic Attack

  • Ptolemaios (Leader of the Ptolemaic Army who fights on a floating pillar)

Sky King

  • Sky Jupiter King (Jupiter King modified for aerial combat which summons Jupiter King head pods and fires large missiles as its attacks)

Try Line (TL)

  • Ball Slug (TL 1st) (A large, mechanical ball that bounces all over the place)
  • Great Mother (TL 2nd) (The matron of the Winged Invaders)
  • K-O3 Coupled Armored Vehicle (TL 3rd) (Three rebel transport vehicles connected to each other)
  • Land Blowfish (TL 4th) (An amphibious landing ship with many Ptolemaic tanks inside ready for deployment)
  • Cyclobster (TL 5th) (A fully evolved mutant jellyfish with sharp tentacles)
  • Slug Square (TL 6th) (A wide Slug with cannons and Gatling guns. Regular Soldiers ride it on its roof)
  • Zoni Doloma (TL 7th) (A large mutant catfish that uses treasures to lure its human prey from the underground)
  • Quadro Jumper (TL 8th) (A highly mobile quadrupedal mecha developed by Caroline which boasts great mobility and flexibility)
  • Fortmeranian (TL 9th) (A large-scale weapon created under Emma using parts of recycled weapons)
  • Giant Copter (TL 10th) (A helicopter connected over a large mechanical tank developed by Midori)
  • Flying Hermit (TL 11th) (Huge Hermit carrying a large airplane for aerial combat. It can now also bombard explosive eggs)
  • Et A Omnis (TL 12th) (A shapeshifting invader that can morph into different forms to attack the enemies)
  • Element Gigant (TL 13th) (A variant of the Rebel Gigant piloted by Allen Jr.)
  • Mini-Bata (TL 14th) (The second mission midboss from Metal Slug now able to extend its main turret vertically)
  • Digger Base (TL 15th) (Large cranes that pull out Slug Diggers from the ground)
  • Screamer (TL 16th) (The third boss from Metal Slug 5 refitted to move on the ground)
  • Airborne Denturion (TL 17th) (The Huge Hermit's tank shell rebuilt for individual use. It is held by two small blimps)
  • Mass Production Tail Slug (TL 18th) (The Tail Slug built for the Regular Soldiers. Its electric weapons are replaced with lasers)
  • Slug Striker (TL 19th) (A mass-produced version of the Slug Rising made specifically for the Regular Soldiers)
  • Arms Copter (TL 20th) (A lesser version of the Giant Copter designed for aerial transport. the Copter had arms contraption which is armed with 2 large axes)

Task Force (TF)

  • Rock Mole (TF 1st) (A repurposed excavator used by the Ptolemaic Army as a weapon)
  • Elder Centipede (TF 2nd) (The same boss from Metal Slug 6 except it can thrive on land)
  • Runaway Brain Robot (TF 3rd) (A remodeled Brain Robot that becomes rampant and uses close range weaponry)
  • Master Kraken (TF 4th) (The Kraken modified by the present-day Rebel Army which fires its frontal cannon or summons its mechanical tentacle to attack the enemies)
  • D-Gu (TF 5th) (An ancient idol figurine unearthed by Caroline that can cast powerful spells against its aggressors)
  • Astro Slug (TF 6th) (The Space Slug from Metal Slug 3. It deploys a massive rocket to provide firepower and HP)
  • Monoeye Gate (TF 7th) (An another variant of the Monoeye UFO. It calls forth circles of Monoeyes to attack the enemies)
  • Crusty Legs (TF 8th) (A quadruped tank created by the Japanese Soldiers which attacks with its mounted cannons)
  • Armored Crawler (TF 9th) (A large excavator resembling the Bull Drill that fires drill missiles)
  • Clone Incubator (TF 10th) (The cloning device from Metal Slug 3 that generates Marco and Fio clones)
  • 7000 Class Locomotive (TF 11th) (The front train from Metal Slug 2/X's third mission ridden by Regular Soldiers)

Recapture

  • Mega Drill Slug (Justice of Summer) A larger upgraded version of the Drill Slug. Marco and Fio are aboard.
  • Queen Big Snail (Halloween Forest) (A massive Big Snail that uses its tentacles to attack)
  • Riviere Hyll (Perfect Doctor) (An aircraft carrier with a sturdy shield on its front. Aside from deploying Flying Taras, two Rebels drop flying poison barrels)
  • Gaia Elephant (2021 New War!!) (The penultimate boss in Metal Slug 5 except it's been attached to a Stone Turtle body)
  • Metal Fusioner No.223 (Re:Merge) (An extraterrestrial bacteria which absorbs Martian technology and uses energy beams to attack)

Ultimate Mission

  • Golden Slug Phoenix (A giant slug based on a phoenix that fires missile salvos and unleashing a powerful electromagnetic energy with its core)
  • Perfect Jupiter King (The penultimate weapon developed by the Rebel Army based on Jupiter King)
  • Avatar of Evil (A large demon-like entity carrying a scythe manipulating the Ptolemaic Army from the shadows)
  • Invader King (The ruler of all of the Invaders who orchestrated the Earth's invasion)
  • Celestial Ruler Rokker (The ultimate and final form of the Sol Dae Rokker)

Metal Slug Infinity

  • Mars Tripod (A three-legged machine created by the Martians which transports Mars People and fires energy beams from its eyes)

Mobile Games

Metal Slug Mobile Impact

Mission

Universal Metal Slug

Mission 1

  • Tetsuyuki (Identical to the boss from Metal Slug but covered with plants)

Mission 2

  • Tani Oh (The same boss from Metal Slug)

Mission 3

  • Hi-Do (A purple blue version of the final boss from Metal Slug but with the number 5 instead of 6 on its door, and Donald Morden is not in it)

Universal Metal Slug: Tank Conspiracy

Mission 1

Mission 2

  • Hozmi (Boss from Metal Slug 2 with different colors)

Mission 3

  • Unknown Alien (Giant alien who made a nest in some place on Earth)

Universal Metal Slug: Fierce Battle

Mission 1

  • Hellfire (Giant blue tank that fires rockets)

Mission 2

Mission 3

  • Cyclops (Giant four-legged robot with Vulcan arms)

Mission 4

  • This mission doesn't have a boss but has a red R-Shobu at the end.

Final Mission

Universal Metal Slug: Triumph

Mission 1

Mission 2

Mission 3

Final Mission

Video Gallery

Bosses
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) | Karn (X) | Allen O'Neil | Dai-Manji

Metal Slug 3 Huge Hermit | Monoeye UFO | Jupiter King | Sol Dae Rokker | Rootmars

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

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 | Screamer | Sand Marine | Avatar of Evil

Black Hound | Stone Turtle (unused) | Gaia Elephant | Ptolemaios (unused)

Metal Slug 6 Bull Drill | Iron Sentinel | Brain Robot | Elder Centipede | Invader King

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 Parachuetruck | 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 | Mars Gigantalos | K-O3 Coupled Armored Vehicle | Land Blowfish | Cyclobster | Slug Square | Zoni Doloma | Quadro Jumper | Denturion | D-Gu | Fortmeranian | Rock Mole | Giant Copter | Et A Omnis | Vortex | Digger Base | Crusty Legs | Armored Crawler | Queen Big Snail | 7000 Class Locomotive | Riviere Hyll | Metal Fusioner No.223
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
Gameplay Elements
Screens Status Screen | Continue Screen | Game Over Screen | Recaptured Prisoners | Best Tank Busters | Arcade Settings
On-Screen Elements Items | Weapons | Slugs | POW | Characters | Enemies | Military Vehicles | Bosses | Environmental Objects | Civilian Vehicles | Rank Medal
Actions Metal Slug Attack | Vulcan Fix | Transformations | Metallish System | Rush Blaster System | Weapon Stock | Deaths | Invulnerability | Canceling | Super Devil Mode
Modes Combat School | Another Story | Another Mission | Storming the Mothership | Fat Island | Office
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