The Iron is the third boss in Metal Slug 4. It is a modified version of the Iron Nokana, specially made for Morden's use.


The Amadeus Syndicate made a personal modification of the Iron Nokana, it equipped with tank treads instead of wheels so it could move faster on any terrain, and has even more improved armor and firepower.

Morden constantly appear to support this vehicle with his bazooka.

On Metal Slug Defense is revealed that the Morden inside the Iron is a fake, giving to think that is probably one of the Amadeus's Morden Robot that appears on his facility.


There will be always a Masknell helping The Iron in the battle. Morden will constantly shoot rockets from his bazooka, and when not, he will enter the cockpit and fire a series of cannon rounds or rockets, open the chassis to use a spinning blade, or try to trample the player with the tank.


  • Like all Metal Slug 4 bosses, it was made using old sprites from previous Metal Slug games.
    • Though it is part of the "Iron Nokana" series, being a modified version, this vehicle's design greatly differs from that of its predecessors.
  • Likes all of Amadeus Syndicate unit in Metal Slug Defense and Metal Slug Attack, it was marked as part of the Independent faction.
    • Although it was part of the Iron Nokana series and has more HP than its predecessors, showing The Iron was improved than original Iron Nokana.
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

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
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 | Gunslinger | Rebel Submarine | Rebel Airplane | Hilde Garn's Slug | Rocket UFO

Rebel Rocket | Hyakutaro

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

Allen Jr.

Metal Slug 3D M-3 Rocket Van | Mosque Artillery | Spider-Bot | Rebel Underground Drill | Morden Battleship | Morden Castle | Allen O'Neil | Lugus | Lieu Monster
Metal Slug Attack Pharaoh's Arc | Ball Slug | Great Mother | K-O3 Coupled Armored Vehicle | Land Blowfish | Cyclobster | Slug Square
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