Asterion

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Many thousands of years ago, Atsaan was one of the "ancients" that kept the worlds. As many different worlds became ridden with sinful acts, Atsaan felt it was his duty to create a new world to extunguish this evil, however, the other ancients were not so pleased with his twisted vision. They used the powers of the ancient relics to seal Atsaan away, however, Atsaan managed to hinder the other ancients before he was sealed away. Astaan would remain sealed away for thousands of years.

Prior to the story The Battle for a Universe, somehow Grodus had found Atsaan's holding chamber, and struck a deal with Atsaan that he would retrieve the relics if Atsaan would grant him one desire. Grodus then set forward to capture the relics, however was not completely successful. The gang arrived at Grodus's abode after collecting the two relics Grodus didn't have, and fought Grodus, who was easily defeated. The gang planned to win, however, Atsaan snatched the two remaining relics from the gang and powered up Grodus to stall until Atsaan could break the seal. The team managed to beat GigaGrodus, however it was too late.

Atsaan warped to his ship, the Biome Buster, along with Luna, who he wanted to serve as his "faithful queen" in the new world he was to rule. Luna was resistant to comply, so he wiped Luna's memory of the past century or so of memory, which was solved later by DMS. The gang arrived at his ship, which was unarmed for the most part. However when attempting to face Atsaan in battle, were easily defeated by Atsaan and the power of the relics. Later, DMS appeared from his paralyzed state, and managed to do some damage with KAISER but was still defeated. When all hope seemed lost, Grodus appeared and managed to survive long enough to throw Atsaan into the ship's power core, where both the Biome Buster and Atsaan were destroyed.