User blog comment:SSWerty/Dragon Ball ST/@comment-1668079-20100615051442

Dark Kai was originally the strongest being in the Universe but he was locked inside the 8th Dragon Ball by the Namekians and so he gave more energy to Serroli to finish them. Serroli started to disobey Dark Kai and soon discovered how to create his own energy through the power that Dark Kai had given him.