Grubba is a character in Paper Mario: The Thousand-Year Door. He ran a fighting ring in Glitzville, called the Glitz Pit. However, Grubba rigged the Glitz Pit, using the Crystal Star to fuel a machine that he used to boost his own strength. When he does so, he becomes Macho Grubba. He is also the original referee of this arena before Jolene took over his duties.