Mrs. Dirt is the mother of Captain James P. Dirt and the controller of his archenemy Moby Duck. She has apparently been pursuing her son for years upon years inside the world of the Great Bathtub after he refused to take a bath. When Tommy Gilligan was sucked down his drain into the bathtub world and joined Jimmy's crew, and fought Moby Duck, Captain Dirt's mother ultimately succeeded in capturing her son and making him take a bath. Jimmy warned Tommy to always listen to his mother as Tommy was sucked back into reality.