Dr. Donut is a Candy Person who appears in "Mystery Train" as one of the apparent murder victims aboard the train. Dr. Donut is the fourth Candy Person whom Finn accuses and was murdered immediately after his accusation. After Nurse Pound Cake, he is the second medical practitioner in Ooo without a Scientific Parasite in his front pocket; presumably because he has no pockets. He has also appeared in "Mortal Recoil" and, almost four seasons later, "The Pajama War."