With energy harnessed from the Golden Egg, Mastered Ultra Egg-stinct Eggyhead (or Mastered Eggy for his nickname) will ravage any of his opponents. With this form, victory is all but certain. Eggyhead can predict his opponents moves before they make them, and counter them accordingly. Eggyhead will only go into this form when his or his friends lives are in grave danger. This form can only be used when one, Eggyhead has the golden egg, and two, when he needs it. This form has given Eggyhead a theory (a correct one) the theory that the golden egg is a living and sentient being.
