Dr. Myuu is a major antagonist in Dragon Ball GT and the creator of most of the Machine Mutants. He is the true main antagonist of the second half of the Black Star Dragon Ball saga, the secondary antagonist of the Baby saga and one of the two main antagonists of the Super 17 saga alongside Dr. Gero. Despite being one of the main villains of the series, he never fought Goku or any of the protagonists for that matter. Instead he used his intelligence to create other villains to fight the heroes.