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Dr. Toad is, as his name would imply, a Toad doctor. He first appears in Mario & Luigi: Superstar Saga, where he is trying to help Mario recover from Bean Fever in Little Fungitown. However, since he does not have the appropriate medicine, he sends Luigi on a quest to get Crabbie Grass from Guffawha Ruins.
In the remake, he is redesigned to have a headlamp.