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Little is known about the X-Nauts except they work for world domination. Sir Grodus strives to become ruler by opening the Thousand-Year Door to release the demon inside.
The X-Nauts are dim-witted and easily fooled. The wit of Sir Grodus's second-in-command and pawn Lord Crump is probably the dimmest. He likes working with machines and his machine-monster Magnus von Grapple.
The X-Nauts threaten the Mushroom Kingdom. They may make more work for Mario than Bowser ever did.