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Doc Drake is a duck and a doctor who specializes in treating dinosaurs in Unjust Desserts. He is also a self-acclaimed Koopologist. He is summoned by Princess Peach after Yoshi eats a Koopa Cherry and becomes sick (eating Luigi in the process), although Bowser, disguised as a Toad, attempts to call him a quack. The reader must find out if Doc Drake is reputable by solving a puzzle that features him in his office and a series of stipulations that all good dino doctors must follow:
As it turns out, Doc Drake follows all of the rules. He eventually arrives to visit Yoshi as Bowser runs away. He produces a bottle of Shrinking Potion and says that it can resolve the situation, but he has also forgotten whether Luigi or Yoshi need to drink it, requiring the reader to complete another puzzle. As it turns out, Luigi needs to swallow it, and the doctor delivers it to him by briefly entering Yoshi's mouth and dropping it down Yoshi's throat. Yoshi also attempts to swallow Doc Drake's arm, and in the process, the bottle fails to reach Luigi. The doctor then produces a second bottle of Shrinking Potion, and Mario promptly drinks it himself so that he can enter Yoshi, find the first bottle, and bring it to Luigi.
Later, after Luigi attempts to drink the medicine but accidentally swallows Mario and Bowser instead, Doc Drake says that Yoshi may also be able to be cured by having him eat a Threelip. However, Mario is not sure if it can help (requiring the reader to solve another puzzle). As it turns out, Doc Drake is right, and after eating the Threelip, Yoshi spits Luigi out. Doc Drake excitedly exclaims that he knew that it might work. He then gives Luigi some Threelip petals, causing Luigi to spit Mario out. When asked, Doc Drake does not immediately remember how to regrow Mario, but he soon remembers that eating some Magic Daisies works. After Mario is cured, Toad asks what happened to Bowser, leading the doctor to pull out a magnifying glass and show that the still-miniaturized Bowser is being chased by an ant. He then takes his leave, though not before asking who he should send his bill to.