Black Impulse, jealous of the Bacterians' incredible forces, decided to make an empire of their own. They bought supplies, weapons and ship designs from the Bacterians for the past few years and made a powerful armada to conquer their galaxy. Their dreams, however, were crushed the chip Thunder Cross. They returned with better ships and weaponry in Thunder Cross II, although they were once again defeated.
- Their Big Core-like ships have crystals as their cores instead of orbs. Even when they are not in ships, those crystal cores can attack.
|Thunder Cross/Thunder Cross II|
|Ships and characters||Blue Thunder M-45 and Red Thunder M-24 • Black Impulse|
|Thunder Cross stages||First Attack • Skyscrapper City • Machine Graveyard • Great Battleship • Endless Labyrinth • Fire Cavern • Final Base|
|Thunder Cross II stages||Air Battle • Machine Fortress • Space Fortress • Waste Factory • Large Battleship • Star Light •|
|Thunder Cross bosses||Egger • Ganger • Garch Jaeger • Bigger • Bogger • Figger • Machinegar|
|Thunder Cross II bosses||Eggerdroid • Ragamuffin • Redcraw Monster • Dinosaur Jr. • Brookrans Works • Laze Zoguylum • Sprouts Layber|