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Shroob Rex is an enemy in the Mario series, first and as of yet only appearing in Mario & Luigi: Partners in Time for the Nintendo DS. They are a Shroob variation of the Rex species that originated in Super Mario World. They can be found only in Shroob Castle, a location in the game that actually takes place in Princess Peach's Castle, albeit a building taken over by the Shroobs. They don't serve much importance other than guarding the castle.