Thread:Sophiedp/@comment-34425563-20190320053208/@comment-31089351-20190320060733

These three officially licensed sources provide undeniable proof that General Grievous is in fact a villain in The Clone Wars:
 * Star Wars: The Clone Wars -- Villains: A Pop-up Storybook
 * Lair of Grievous Episode Guide
 * The Clone Wars Villains