The Terra Core (ティエラーコア, Tierā Koa^?) is the first boss in Gradius Galaxies.

Attack patterns

Note: All attack names are purely conjectural.

• "Beam Shot Terra" - The Terra Core fires two lasers in a similar fashion to Big Core MK I. It stops this attack at the 6th shot if the warship still have its asteroid shell.
• "Asteroid Hurl" - While hiding inside its asteroid shell, the Terra Core stops and shakes to summon 5 asteroids hurling around.

Gradius Galaxies
Ships	Vic Viper
Stages	Meteorite • Glass • Artificial Galaxy • Underground Volcano • Moai • In Vivo • Comet • Fortress
Bosses	Terra Core • Crystal Gust • Volleone • Bolboros • Dogaltes • Brachion Eye • Perla Meralda • Rexion Core • Cliff Core • Rotating Wall • Eleos Brain

Core Warships
Big Cores	Big Core MK I (Old Big Core) • 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 • Berserk Core • Big Core Duo • Big Core DX-01 • Big Core Orthos • Big Core Prometheus • Blaster Cannon Core • Boost Core • Bubble Core • Circle Core • Coreship • Crater Core • Crystal Core • Dellinger Core • Desert Core • Heaven's Gate • Juggler Core • Laser Core • Lizard Core • Mirrored Core • Neo Big Core • Parasite Core • Perla Meralda • Planet Core • Rexion Core • Rolling Core • Serpent Core • Shining Core • Super Big Core • Terra Core • Vanishing Core • Genocide Core • Odin Core
Core-style bosses	Abaddon Warship • Bolboros • Covered Core • Covered Core MK II • Dead End • Deltatry • 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 • Tri-Pod Core • Triple Core • Crash Bam
Tetran variants	Tetran (Zylom • Tetran Sweeper • Tetran Scavenger) • Covered Tetran • Crystal Core D-X02 • Laser Tetran • Tenny Rop
Parody Cores	Candy Core • Decoration Core • Decoration Core MK II • Viva Core