The titular Gundam is a sentient machine that can act without the need for a pilot and is one of the many weapons made によって the resistance group called the Galaxy オオカミ to combat the corrupt portions of the Global Union and the Zeppoles Empire.
In the 年 1057 of the 星, つ星 Era(I made this one up), he was activated in the resistance-owned 宇宙 Colony, Area 4, によって a teenager named Rayzer Saseon, when Zeppoles Soldiers raid the place, stealing a bunch of human-like androids and subsequently getting the entire place wrecked in the entire process, forcing the residents and Silver to flee to the ship called the Black Star. Silver's battle for the good of the universe had just begun.