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“But if we don't follow his advice to not follow his advice," “then aren't we following his advice?”
  —The Other Doctor  

The Other Doctor is a doctor at the Piqua Valley Home for The Reality Challenged. He only appears in Captain Underpants and the Sensational Saga of Sir Stinks-A-Lot

He is easily fooled, and let Sir Stinks-A-Lot escape from Piqua Valley Home for The Reality Challenged because he was asked a question, that anybody with a normal sized brain would ignore