Sailor Galaxia is the queen of the "Shadow Galactica" empire and she lives in the "Galaxia Palace". She used her Galactica Bracelets, in which her power is sealed, to the Sailor Anima-mates. The bracelets turned them into her slaves. When the bracelets are taken away her slaves are destroyed. Galaxia believed that if she took the place where all stars were born, the Galaxy Cauldron of Zero Star of Sagittarius (the center of the galaxy), she could control them freely.

Galaxia appeared to steal Chiba Mamoru's Sailor Crystal, the Golden Crystal, from him at the airport where he was to depart to America's Hardford University. He had just given Usagi a ring and told her he loved her when the golden soldier ripped the crystal from his body. Usagi, too horrified by the event, passed out and it wasn't until later that she was able to remember the incident. By the time Iron Mouse and Aluminum Seiren were defeated they had collected two Sailor Crystals for their master. One by one Galaxia obtained the Solar System's Sailor Crystals until it was left to Eternal Sailor Moon to fight against her. It was this that she told Sailor Moon, "I was born alone as trash, on a planet of trash," she says. "I could do nothing but wander in solitude, living my days like I was in hell. But I have power as a sailor soldier. One day, it suddenly awakened. I was a chosen one. But being a mere sailor soldier would be the same as being trash. I had to have the strongest planet, carrying the strongest power! I came searching for a planet of my own, suitable for me! And then I found it. A magnificent planet. And to get that planet, I need the galaxy's ultimate power!"

To obtain that power she wanted the galaxy's strongest Sailor Crystal, Sailor Moon's Silver Crystal. "Carrier of the galaxy's strongest sailor crystal!" Galaxia thinks. "Why is it Sailor Moon! That girl of trash who doesn't do a thing! But whatever it takes, I have to get her power! So I can defeat Chaos and make the entire galaxy mine! I must have that power!" They eventually end up at the Galaxy Cauldron where Galaxia taunted Sailor Moon more and more, trying to get her to unleash her full power. Just when she was going to offer her enemy to Chaos she was knocked fromthe cliff by a blast of light emitted from the Cauldron. Sailor Moon grabbed her and pulled her back. Galaxia can't understand why Sailor Moon saved her, but Moon told her that she saw the lonliness of herself inside her. When Sailor Chibichibi told Sailor Moon to destroy the Cauldron to defeat Chaos who was now one with it, Sailor Moon expressed her hope for the future and Galaxia reached out to her. "Sailor Moon..! You believe in such a distant future for this universe? Sailor Moon, are you the soldier that draws in everything? Sailor Moon... I've finally found it. My planet..." The bracelets on her wrists cracked and she fell to her knees. "Too big... Too radiant... My arms don't reach... But that planet will continue to shine in this universe eternally..." Her bracelets broke and she disappeared, leaving only the golden broach she wore.

Powers

Galactica Inflation, Galactica Super String, Galactica Bracelets