Dark Matter Thieves

The Dark Matter Thieves are a group of alien invaders led by the powerful Lord Boros that attacked various planets to find valid opponents.

Headquarters
The Dark Matter Thieves headquarters is a giant spaceship, so big that can obscure even A-City. It's heavily armed with cannons able to shoot enormous destructive bullets and is able to fly thanks to a Gravity Sphere, the destruction of which makes the spaceship fall almost immediately.