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The Cyclobster is a monstrous mutant jellyfish, exclusive to Metal Slug Attack. It first made its debut on the game's event titled 'Try Line 5th', where the boss can also become a playable unit.


A new type of giant mutant weapon discovered by the Ptolemaic Army. It seems likely that it evolved from a mutant weapon discarded by the Rebel Army. With strength beyond any known creature, it destroys everything it sees with its huge and mighty tentacles.

~Metal Slug Attack in-game description.


In Metal Slug Attack's event, This boss is fought at the last stage. It uses its barbed oral tentacles to attack the player's units with its oral tentacles. The player also must be cautious as its attacks are capable of stunning the player's units.

The special attack of the boss lets it fly up out of the map before it subjects an area with flurries of stabs with its large tentacles (duration extended with MSA Skill small +.png 4). The boss invulnerable and immune to attacks for the entire duration of the special attack, and to add insult to the injury: This attack cannot be baited at all by any means.

Once done with its special attack, it will return to the nearest unit that went past over it while performing its special attack. The player must use his/her units' disables otherwise the boss will wreak havoc.


Cyclobster MSA idle.gif Cyclobster: The original version.
Sol De Cyclo: A Cyclobster further mutated after attempting to absorb the energy of a unknown entity. Now mutated green, it exchanges its melee attacks for ranged ones such as spawning larvae and glowing its eye to emit numerous energy projectiles.
Golden Cyclo: A Cyclobster further mutated after attempting to absorb an unknown substance. Now mutated gold, its melee attacks backs like the original version, it attacks with it barber oral tentacle, and fly up out of the map before it subjects an area making two stabs with its large tentacles using energy power.



  • The boss has several unused sprites in its sheet. It includes a glowing eye similar to the Sol Dae Rokker which was later used for Sol de Cyclo.
  • Its name is derived from the words "Cyclops", a one-eyed Greek mythological giants and a "Lobster", a type of crustacean.
Metal Slug TetsuyukiHairbuster RibertsTani OhShoe & KarnIron NokanaHi-Do
Mini-Bosses: Mini-BataAllen O'Neil
Metal Slug 2/X The Keesi II / Iron Nokana MK II (X) • Aeshi NeroDragon NosukeBig ShieeHozmiRugname
Mini-Bosses: Mosque ArtilleryThe Keesi II (X) • Karn (X) • Allen O'NeilDai-Manji
Metal Slug 3 Huge HermitMonoeye UFOJupiter KingSol Dae RokkerRootmars
Mini-Bosses: Twin Ohumein-CongaMonoeyesHairbuster RibertsHi-DoRugnameFake RootmarsClone Incubator
Metal Slug 4 Brave GuerrierToschka DalanueThe IronBig JohnSea SatanAmadeus Mother Computer
Mini-Bosses: Mecha Allen O'Neil
Metal Slug 5 Metal RearShooting RayScreamerSand MarineAvatar of Evil
Mini-Bosses: Black HoundStone Turtle (unused) • Gaia ElephantPtolemaios (unused)
Metal Slug 6 Bull DrillIron SentinelBrain RobotElder CentipedeInvader King
Mini-Bosses: Invader ControllerKing's Cocoon
Metal Slug 7/XX Iron Death WormCrablopsDestroyed CrablopsFall ClimberThe UnionRebel GigantKraken
Mini-Bosses: Scrap TowerBig Gate
Metal Slug: 1st Mission Rebel VTOLRebel TrainMacbaRebel ZeppelinElectromagnetic CraneWeapons Port BossMetal Strider
Mini-Bosses: Facility ElevatorMacbaRebel Truck
Metal Slug: 2nd Mission Big BerthaTerrain CarrierRebel ReactorMacbaRebel SubmarineTani OhWiredRebel AirplaneMetal StriderRocket UFO
Mini-Bosses: Power GeneratorsRebel RocketHyakutaro
Metal Slug Advance FormorEmain MachaKaladgolgThe Keesi IIICabracan
Mini-Bosses: Allen Jr.
Metal Slug 3D ParachuetruckMosque ArtillerySpider-BotUnderground Cruise MissileMorden's BattleshipMorden's CastleAllen O'NeilLugusLieu
Metal Slug Attack Pharaoh's ArcPtolemaiosBall SlugGreat MotherMars GigantalosK-O3 Coupled Armored VehicleLand BlowfishCyclobsterSlug SquareZoni DolomaQuadro JumperDenturionD-GuFortmeranianRock MoleGiant CopterEt A OmnisVortexDigger BaseCrusty LegsArmored CrawlerQueen Big Snail7000 Class LocomotiveRiviere HyllMetal Fusioner No.223Drum SlugMars WolfSea DragonTetsujin SquadLa TorneGigantnoidDark GateKnight TankImpact CannonDive Assault Cannon Andrew
Mobile games Rocket Control RoomUnknown AlienHellfireSpiderbotCyclopsMega Laser TurretMars Battle UFOM-32 Water Carrier PlaneKouraiAlien Floating Structure