X-Naut PhDs are the scientists of Grodus' empire. They are the ones who create the various potions for X-Nauts and Elite X-Nauts that increase their power or health. They also created the Yux species and the Magnus Von Grapple . X-Naut PhDs themselves are a tough opponent since the potions they throw can set Mario on fire, increase their power, or heal themselves.

The X-Naut Army
Leaders: |
Underlings: X-Naut | |
Yuxes: Yux | Mini-Yux | Z-Yux | | X-Yux |
Other: Characters: | | | Beldam | Marilyn | Vivian | Doopliss

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