Long ago, a little foal was born into a tribe of magical metal horned unicorns. But his horn was not metal and he didn't have any magical powers. Everyone had thought that he was born to save the tribe from the evil sorcerer, Magh. But how could that be? Everyone knew "no metal, means no magic!"
Yet, the Moon-Star Numen prophesized that the blue unicorn would be the one to save the tribe and bring the survivors back home to Unimaise. The others don't have much faith in Blue but as he grows he develops an adventurous spirit and good old common sense. After one final message from the Numen, he leaves the safety of the Halstable to take on the challenge alone.
He is soon joined by his mentor Gaiso, the Stag and his friend, Girasol the Firebird. Together, the companions save a Humongous Elutron from the Bugans and they rescue Gwyn the Pendragon from Yegwa, an evil spirit.
Meanwhile, the rest of Blue's tribe learn that all horns will be required to meet horn tip to horn tip in order for Blue to receive the Numen's magic. They race toward Muzika Wood in a desperate bid to reach him before the Moon-Star arrives. In their travels, they barely escape Magh's city of Kudos with their lives. One unicorn is nearly gummed to death by a Blind Blober in the Caulis Caverns. With misadventures all around, will destiny prevail?