X-Naut PhDs are expert X-Naut scientists, as the name implies. These X-Nauts wear lab coats and blue uniforms. It is usually responsible for building the inventions the other X-Nauts use for their plans, such as the Magnus Von Grapple Robots. It attacks by throwing chemicals at Mario and his team. They also created the species called Yux.
Trivia
- The "PhD" in X-Naut PhD's name most likely stands for its real-world equivalent: physical doctor.