From the Super Mario Wiki
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He first appears at the beginning of the episode, eavesdropping on Stanley, who happened to be taking care of his plant Herman. Realizing that Herman would cost him a fortune, Mr. X stole Herman, and Donkey Kong, who happened to be nearby, assisted. The two then traveled to a supermarket; when Herman ate part of the register, Mr. X stole some of the money inside. After a brief crime spree, Mr. X decided to head to Hornby Manor to partake in the Great Ball. While he was enjoying himself, Mario managed to momentarily distract him by giving him too many balloons; however, soon after Herman was left behind by Stanley due to him fending off yet another bug, allowing Mr. X to steal him again. He then took Herman and Donkey Kong to his secret room in the manor, where the two proceeded to double-cross him. Mr. X was then promptly arrested.