Dark Cosmic Fleet

The Dark Cosmic Fleet, rendered in some releases as the Dark Universe Army, was a squadron of alien conquerors that roamed the stars. Command fell to a nameless extraterrestrial whose lifespan stretched past ten thousand years. The group counted no fewer than eight vessels built for journeys between star systems, each presumably packed with countless alien crew.

Every ship in the armada carried heavy artillery, much like the enormous craft flown by the Dark Matter Thieves. Their deadliest instrument was the Great Starlight Extreme Compression Cannon, a weapon kept locked away for ages because its output was so tremendous. Fired at full capacity, such cannons were thought able to level vast areas and unleash violent shockwaves. The commander feared those waves might reach his own fleet even across a great gulf of space, so he ordered the ships to pull back farther from Earth before opening fire.

Their only recorded assault comes in the extra chapter Reflection, set after Boros had been beaten. The fleet drifted toward Earth and correctly pinned Saitama as the one who had ended the ruler of the Dark Matter Thieves. On the nameless alien's order, every cannon discharged at full strength straight at the hero. The beams struck his bare scalp, ricocheted, and curved back into the fleet, wiping it out entirely.

The armada answered to a single unnamed alien commander, an ancient being who had lived for well over ten thousand years and who gave the order that doomed the group. No other members are individually named in the source material.