This one has four cores to destroy and builds upon Big Core MK III by having detachable arms that shoot.
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.
|Ships||Vic Viper T-301|
|Stages||Planet Gradius Satellite Orbit • Planet Gradius City Sky A • Planet Gradius Urban Underground Hierarchy • Bacterian Cell Center • Asteroid Front Base • Bacterian Multiplication Plant • Bacterian Fortification Center • Planet Gradius City Sky B|
|Bosses||Big Core MK-I Rev.2 • Venom (lower) • Death MK III • Tetran • Big Core MK II • Big Core MK IV • Ground Spider • Huge Heart • Blaster Cannon Core • Rolling Core • Circle Core • Big Core MK III • Covered Core MK II • Beacon • Keeper's Core • Elephant Gear • Venom (upper)|
|Big Cores||Big Core MK I • Big Core Custom • Big Core MK-I Rev.2 • Big Core MK II • Big Core MK II Kai • Big Core MK III • Big Core MK IV|
|Big Core variants||Beacon • Big Core Duo • Blaster Cannon Core • Bubble Core • Circle Core • Coreship • Crater Core • Crystal Core • Dellinger Core • Desert Core • Heaven's Gate • Juggler Core • Laser Core • Lizard Core • Neo Big Core • Perla Meralda • Rexion Core • Rolling Core • Shining Core • Super Big Core • Terra Core • Vanishing Core • Genocide Core • Odin Core|
|Core-style bosses||Abaddon Warship • Covered Core • Covered Core MK II • Dead End • Kraken • Mayhem Warship • Metal Slave • Misfit Warship • Queensrÿche • Riot Warship • Plate Core|
|Pseudo-Cores||Death • Death MK II (DeathDouble) • Death MK III • Beta Core • Nobil • Triple Core • Crash Bam|
|Tetran variants||Tetran (Zylom) • Covered Tetran • Crystal Core D-X02 • Laser Tetran • Tenny Rop|
|Parody Cores||Candy Core • Decoration Core • Decoration Core MK II • Viva Core|