Amadeus Syndicate
Leader Doctor
Founded 2030-2031 (exact date unknown)
Headquarters Unnamed communications facility, location unknown (somewhere in Oceania)
Area of Operations Worldwide
Enemies With Regular Army

Ptolemaic Army (Metal Slug Attack) Martians (Metal Slug Attack)
Invaders (Metal Slug Attack)

Affiliated With Rebel Army

The Amadeus Syndicate serve as the main antagonists of Metal Slug 4. With the money they were able to obtain from their banks around the world, they became a very rich company. Their leader, the tentatively named Doctor, was a friend of Morden, and when the Rebel Army lost their funding (after the events of Metal Slug 6) the Syndicate helped them by supplying the Rebel Army with more troops, weapons, and vehicles.

The corporation was destroyed during at the end of the White Baby Crisis, where the Regular Army infiltrated their headquarters and defeated the Doctor, causing the base to self-destruct.

The Amadeus Syndicate appears as a small organization due to the game reusing weapons and infantry from other armies. The Syndicate is in the Independent Faction in Metal Slug Defense and Metal Slug Attack because of this.

In Metal Slug Attack, the Syndicate's forces has been expanded and now sport a violet and gray motif. Since Regular Army soldiers make an appearance in the game (who sport blue uniforms, which were used in Metal Slug 4 by the Syndicate), Syndicate members wear a violet uniform. The Syndicate also developed numerous robots and machines based off the Rebel Army's designs, with a few modifications to them. They are still on good terms with the Rebel Army.


Human Infantry

0038.gif Amadeus Infantry: They rappel down from the ceilings and are generally better equipped than their green counterparts. They may be some kind of Special Forces unit, or honor guards.
Elite Grenadier.gif Amadeus Grenadier: Same as the rebel soldiers.
BombBallAmadeus.gif Amadeus Rolling Bomb Soldier: They throw rolling bombs towards the player just like it's rebel counterpart.
RocketAmadeus.gifRocketBombAmdeus.gif Amadeus Rocket Bomb Soldier: They throws rocket bombs exactly like the rebels. In Metal Slug Attack, they can throw up to five rockets that are able to block enemy projectiles.
GunAmadeus.gifAmadeusElite.gif AR-10 MG Infantry/Amadeus Corporal: Armed with 7.62mm AR-10 Autorifle, they are the elite legion of the Amadeus Syndicate. Some of them have the honor to serve as personal guards of Amadeus. They are very dangerous in comparison to other infantry. In Metal Slug Attack, they are capable of shooting for longer periods of time.
RifleAmadeus.gif Amadeus Rifleman: Amadeus Syndicate rifleman soldier in purple uniform which exclusively appears in Metal Slug Attack. They can rapid-fire while crouching, and their projectiles travel at a very long range.
Shield Amadeus.gif Amadeus Shielded Soldier: Amadeus Syndicate shielded soldier in purple uniform which exclusively appears in Metal Slug Attack. They have a high chance of knocking back the enemy.
MortarAmadeus.gif Amadeus Mortar: Amadeus Syndicate mortar soldier in purple uniform which exclusively appears in Metal Slug Attack. They shoot shells that are able to poison enemies.
BazookaAmadeus.gif Amadeus Soldier (Bazooka): Amadeus Syndicate bazooka soldier in purple uniform which exclusively appears in Metal Slug Attack. Soldiers on board of the Brave Guerrier are similar to the Rebel Bazooka but spawn in groups. Those on foot fire larger shots that have unlimited range. Paratroopers can also be deployed via air, using their bazookas to rapid-fire at nearby enemies. Golden variants are also accompanied by parachuted bombs to protect them from most attacks.
Hazmat Soldiers: Amadeus Infantry invading the Haunted House attractions. Yellow Hazmat Soldiers patrol the zombie attraction and throw grenades. Green Hazmat Soldiers patrol the Egyptian attraction and toss bowling ball grenades that spawn mummies. Hazmat soldiers have higher body protection. Golden variants are exclusive to Metal Slug Attack, who toss bowling ball grenades that spawn golden Man Eaters.

Mechanical Infantry

Morden Robot: A robotic look-alike of Donald Morden, who fires a bazooka. When they take damage, they become visually degraded and have a self-destruct protocol. A golden variant appears in Metal Slug Attack that possesses greater durability.
Mecha Allen: A robotic look-alike of Allen O'Neil, who acts similarly to the original.
Cyborg Soldier: A robotic look-alike of standard Amadeus Infantry, its design being influenced by the Rebels' Special Forces infantry. They attack with a combat knife and are capable of moving quickly to perform "phantom" attacks with their knife. Exclusive to Metal Slug Attack.

Syndicate Members


Artificial Intelligence


Other Members/Groups


Most of the ground vehicles are from the Rebel Army. In Metal Slug Attack, these are recolored gray to differentiate from the Rebel versions. Remakes of larger weapons are colored purple.

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