The Sea Worm is the fourth boss in Metal Slug 6.


Most of the attacks aren't really that hard to dodge, but the Sea Worm will be constantly changing position, so be ready for a difficult fight. When its appears, depending on the difficulty, its will start off by spitting about 3 to 8 acid spit projectiles at the player, so go underneath its head to avoid these. Get away when he stops, though, as it will begin to spiral in a circle off the screen, and if the player get caught in the middle, the player die. Its will reappear on the right, spiralling towards you. Jump on to its body to avoid being skewered by its head. its floats upright, and takes a few more acid spit shots at the player. it then twists his entire body around, causing razor sharp wind to appear around each segment.

A well timed jump avoids this. Again, its will spiral in a circle, so make sure you're not stuck in the middle. Its reappears the left side, and will spit a trail of acid spits which goes up and down the stage. Hide under the Big Shiee to avoid this. After this, its just repeats until the player get rid of half his life. When it's flaming, he will spiral around the center, firing 5 energy blasts at the player. Just dodge over these or shoot them, and finish him off. If the Slug Flyer still available, this battle is made easier/harder depending on your skill.


  • The Sea Worm is reminiscent of the Sandworms of Arrakis from the classic sci-fi novel series Dune, but a polar opposite, as this operates in a water environment. Both are also formidable.
  • If the player still has the Slug Flyer, the Sea Worm will spit its acid much faster.
  • The Worm Mecha from Metal Slug 7/XX resembles the Sea Worm in terms of movement and the ability to move its separate body parts.
  • It is currently unknown if the Sea Worm is a combination of a mutated animal and a machine. This is evidenced by the Sea Worm showing smoke emanating from its body after it has been heavily damaged, and that more smoke spews out after its scales become damaged and chipped-off after suffering heavy fire.
  • The ship present before the boss fight resembles the Big Shiee, just without its weapons. Some people think that the Big Shiee was attacked by the Seaworm.


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