It has been a couple days since Celeron defeated Yamma in the Tournament of Destroyers, once again keeping Earth safe... However, that fight rendered him useless from fighting for two months.
That happened at a terrible moment as there was yet another danger approaching. Frieza's and Cooler's grandfather, Zero... He had arrived on the planet to finish his grandchildren's work, which was Saiyan extermination...
Our heroes stood forth and rushed towards the dangerous Ki... The Z-Fighters and the Saiyans have arrived... And watched in shock at who it had shown up... And the power he had been emanating...