Metal Slug Wiki
Metal Slug Wiki

The Lieu, pronounced Luu by Oguma, is the Final Boss of Metal Slug 3D after Lugus.


The origins of Lieu were coming from one of Oguma's experiments. However due it's unstable state, Oguma decided to abandon Lieu inside the North Pole's Alator. In 2030s after South Pole's Alator were activated in favor of Lugus, it inadvertently also activated North Pole's Alator which resulted the awakening of Lieu causing it to travelling towards South Pole's Alator. After Lugus is almost defeated, Lieu somehow managed to reach South Pole's Alator much to the surprise of Oguma, Marco, Eri, Tarma and Fio. Lieu then unleashed a reddish fluid-like flesh towards Lugus consuming it and trapping the Regular Army cadets inside. Rumi Aikawa then drops the SV-001 in order to destroy Lieu. Once defeated, the Lieu starts collapsing with Marco, Eri, Tarma and Fio escaping via a Regular Army Helicopter while Oguma and his henchmen stay behind. Oguma is then consumed by Lieu causing it to be destroyed in a huge energy blast.


He shoots laser with many eyes (not the main eye), some eyes can be destroyed either dropping materials, weapons, health packs or gas tanks. After a few moments, it grows 2 arms with one eye in both arms. The eye acts similar to the previous eyes. If you get close to the arms, it will slash you with its finger. When one arm is defeated, Lieu's main eye will be exposed. Should both arms be defeated, it will give you extra time. At this point several faces start raining the area. If the player doesn't attack the remaining arm, it will retreat and the face will try to eat you. Several arms will then try to punch you before a foot finally falls from above trying to crush you. After dealing enough damage to the Lieu, it will endlessly scream as the faces keep falling from above.


  • The smaller faces have ears while the main big face doesn't.
  • The small eye pods bear similarities with the Unknown Alien's stage.
Metal Slug 3D
Major Characters Marco Rossi | Eri Kasamoto | Tarma Roving | Fio Germi
Supporting Characters Rumi Aikawa
Antagonists Donald Morden | Allen O'Neil | Oguma
Organizations Regular Army (Peregrine Falcons | S.P.A.R.R.O.W.S) | Rebel Army | Oguma Corporation
Bosses M-3 Rocket Launch Support Van | Mosque Artillery | Spider-Bot | Underground Cruise Missile | Morden's Battleship | Morden's Castle | Allen O'Neil | Lugus | Lieu
Weapons Heavy Machine Gun | Rocket Launcher | Laser Gun | Shotgun | Flame Shot | Enemy Chaser | Iron Lizard | Super Grenade | Drop Shot | Double Machine Gun | Grenade | Fire Bomb | Monolith | Sniper Rifle | Smoke Bomb
Slugs SV-001 | Slug Gunner | Slug Flyer | Slug Mariner
Missions "Start From Mountain Village" | "Be Headquartered in the City" | "Desert Town" | "Coal Mine Mark" | "Coal Underground Ruins" | "Atmospheric Discharge" | "Break the Barrier" | "Sink Under the Waves" | "The South Pole" | "Climb the Tower" | "Out of Control"
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