The Formor is the first boss of Metal Slug Advance. This tank is the Rebel Army's imitation of the SV-001 Metal Slug.


"This Slug has been developed by Morden's Armies.It moves faster than any Slug of the Regular Army despite its size."-MSD info

The Formor is twice as big as a regular Metal Slug, and it is painted green. The Formor is mostly a smaller version of the Ptolemaic Army's giant Metal Rear, with more maneuverability but less powerful than its giant cousin. Instead of the vulcans, the Formor uses what appears to be autocannons.


Formors first phase will involve it firing its main cannon, autocannons and running over the player. In its second phase, after losing half of its health, it will also try to jump on top of the player.

As this tank attempts to run over the player, its bottom is revealed exposing a weak point, as indicated by a minor explosion every time it gets hit there, allowing the player to deal extra damage.

Due to its low health, Formor can easily be beaten by using the Metal Slug or Shotgun acquired earlier in the level. Moreover, the player can also simply use grenades and the handgun. The Black Hound, Armor Piercer, and Crawler cards are also effective and will make short work of this boss. Defeating Formor again in a fast time will unlock Formor's Card.


  • Even though the Formor is much smaller than the Metal Rear, they both seem to have around the same amount of HP.
  • Metal Slug Advance's card indicates it's 3 times as big as the normal Metal Slug, though this has been disproved.
  • it also appears in Metal Slug Defense as an affordable unit with stars in the 2015 Christmas event.
  • It also appears in Metal Slug Attack as an event unit, on the Extra Ops: Boy Memories, its parts can be obtained through the POWs rescued in a random stages... Also, Formor is the only rare unit in Metal Slug Attack which is a boss.
  • To date, Formor is the smallest boss in the entire Metal Slug franchise.


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