Bosses

In video games, Bosses are very tough 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. This also includes mini-bosses.

Metal Slug

Mission 1

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

Mission 2

• Mini-Bata (Self-propelled railway gun; mini-boss)
• Hairbuster Riberts (Prototype rebellion Heavy Bomber controlled by Donald Morden)

Mission 3

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

• Hi-Do (Second generation attack helicopter built specifically for Donald Morden)

Metal Slug 2

Mission 1

• Mosque Artillery (Three vigilance towers; mini-boss)
• The Keesi II (VTOL heavy bomber, a combined bomber and troop transport)

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

• Sol Dae Rokker (Japanese sun god's instrument that guards the ruins)

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)
• Clone Incubator (A machine that produces Clones of your first character)
• Rootmars (Leader of the Mars People, who looks like a huge martian head with an exposed brain)

Metal Slug 4

Mission 1

• Brave Guerrier (Amadeus blimp "Brave Guerrier")

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 fake Donald Morden)

Mission 4

• Big John (Giant animatronic defense system created 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

• Cyborg Allen O'Neil (Robotic version of Allen; mini-boss)
• Doctor (Mad scientist who leads the Amadeus syndicate)

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

• Gaia Elephant (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

• Bull Drill (Giant Rebel drilling machine)

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

• Elder Centipede (Giant worm-like arthopod found in the ocean)

Final Mission

• Invader Controller (Green robotic variant of the Flying Parasite that controls one of the main characters not chosen; mini-boss)
• Invader King (Leader of the Invaders)

Metal Slug 7

Mission 1

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

Mission 2

• Crablops (Giant crab-cyclops robot)

Mission 3

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

Mission 4

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

Mission 5

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

Mission 6

• Rebel Gigant (Giant walker controlled by Allen O'Neil)

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 SV-001, twice as big and has same weapons)

Mission 2

• Emain Macha (Two tanks also called "The Twins")

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)

• Rebel Train (A slowly, oncoming, weaponized train)

Mission 6 (Penetration of the Front Base)

• Macba (Lieutenant Colonel who fights with knives)

Mission 10 (Night Flight)

• Rebel Zeppelin (Large blimp with cannons everywhere)

Mission 12 (Weapons Dump)

• Electromagnetic Crane (Crane that dumps blocks of landfill on the player)

Mission 14 (Weapons Port)

• Weapons Port Boss (A cargo ship with cannons in the front and back)

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, the Metal Strider)

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)

• Terrain Carrier (Land Battleship with two sets of cannons to destroy)

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)

• Macba

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)
• Metal Strider (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

• Rocket Control Room (A room with a heavily protected machine and a 80-second countdown)

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

• The Keesi II MK-2 (Boss from Metal Slug 2 slightly modified)

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

• Spiderbot (Giant spider-like robot)

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

• Mega Laser Turret (Laser turret of a Rebel airplane used for its defense)

Universal Metal Slug: Triumph

Mission 1

• Mars Battle UFO (Enhanced UFO driven by an elite Martian)

Mission 2

• M-32 Water Carrier Plane (Big carrier plane that uses its cargo to attack)

Mission 3

• Mecha Kaiju (Giant dragon-like robot)

Final Mission

• Alien Floating Structure (Giant ancient structure with many hieroglyphs on it)

Video Gallery

Metal Slug - All Bosses (Hard Level-8 No Death) - 1,2,X,3,4,5,6,7,XX