Gradius Wiki
Gradius Wiki

Big Core MK IV (ビッグコアMk-IV?) is the final boss of the 1st boss rush in stage 2 of Gradius V.


This one has four cores to destroy and builds upon Big Core MK III by having detachable arms that shoot.

Attack patterns

Big Core MK IV attacks in several patterns. First, the arms will detach and shoot waving energy beams. Along those beams will be giant plasma balls that will shrink if continuously shot. After those pass, smaller energy balls will travel along the beams and shoot lasers up/down or left/right depending on the configuration. During this phase, homing lasers will also be shot at you. After this phase, the arms will reattach then be released, this time shooting the beams up and down. The main pattern is the same.

In Loop 2 or higher, it will fire a steady laser stream. They restrict the player's movement, making aiming at the top and bottom cores difficult.



  • The reason why Big Core MK IV only made its debut in Gradius V and not Gradius IV is that the latter is meant to be the revival and not a sequel, thus they have no plans to make a direct successor of Big Core MK III in Gradius IV.
Gradius V
Ships Vic Viper T-301
Stages Planet Gradius Satellite OrbitPlanet Gradius City Sky APlanet Gradius Urban Underground HierarchyBacterian Cell CenterAsteroid Front BaseBacterian Multiplication PlantBacterian Fortification CenterPlanet Gradius City Sky B
Bosses Big Core MK-I Rev.2Venom (lower) • Death MK IIITetranBig Core MK IIBig Core MK IVGround SpiderHuge HeartBlaster Cannon CoreRolling CoreCircle CoreBig Core MK IIICovered Core MK IIBeaconKeeper's CoreElephant GearVenom (upper)
Core Warships
Big Cores Big Core MK IBig Core CustomBig Core MK-I Rev.2Big Core MK IIBig Core MK II KaiBig Core MK IIIBig Core MK IV
Big Core variants BeaconBig Core DuoBlaster Cannon CoreBubble CoreCircle CoreCoreshipCrater CoreCrystal CoreDellinger CoreDesert CoreHeaven's GateJuggler CoreLaser CoreLizard CoreNeo Big CorePerla MeraldaRexion CoreRolling CoreShining CoreSuper Big CoreTerra CoreVanishing CoreGenocide CoreOdin Core
Core-style bosses Abaddon WarshipCovered CoreCovered Core MK IIDead EndKrakenMayhem WarshipMetal SlaveMisfit WarshipQueensrÿcheRiot WarshipPlate Core
Pseudo-Cores DeathDeath MK II (DeathDouble) • Death MK IIIBeta CoreNobilTriple CoreCrash Bam
Tetran variants Tetran (Zylom) • Covered TetranCrystal Core D-X02Laser TetranTenny Rop
Parody Cores Candy CoreDecoration CoreDecoration Core MK IIViva Core