Yu-Gi-Oh! ZEXAL - Episode 099
Don Thousand is the deity of Barian World within the Yu-Gi-Oh! ZEXAL anime. After his battle with Astral thousands of years ago, he was imprisoned in the Sea of Ill Intent. Eventually, Vector released him in processes merged with him.
It was revealed that Don Thousand fought Astral few million years ago. The battle went on for hundreds of days and almost destroyed Earth. Throughout this battle, Thousand implanted in Astral a fragment of his malice, eventually born as a "Number", 96. Eventually, the two collided and Astral became victorious sealing Don in the Sea of Ill Intent as captive.
Yu-Gi-Oh! ZEXAL IIEdit
Frustrated by his loss against Yuma, Vector dives into the Sea of Ill Intent in order to free the Barians deity, Don Thousand. Don Thousand granted Vector his power in exchange for locating the seven Legendary Numbers that sealed him away long ago. To achieve his plans, Don Thousand merges with Vector, and briefly possesses him. Locating some of these Numbers with assistance from Mr. Heartland (after his resurrection by Vector), who had been transformed into a fly after falling into the Barian World, Vector uses his new powers to accelerate the healing of Alito and Girag.