Zippity-Doo Doctor is the 46th chapter of the Dr. Slump manga. It is the sequel to "The Happy Doctor", and it is followed by "The Dumbfounded Doctor".
Summary[]
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Senbei asks Arale to attack the monster
Senbei Norimaki, Midori Yamabuki, Arale Norimaki and Gatchan are on a trip to space. They land on a star-shaped planet inhabited by strange-looking animals because Senbei has to poop. While he is doing so, a giant gorilla monster kidnaps Midori and wats to eat her. Senbei asks Arale to attack the monster, but she is then distracted by a flying octopus and follows it with Gatchan.
Senbei uses the Ponpoko Morph Gun to turn the giant monster into an ant and save Midori Yamabuki. As Midori was in the monster's hand, both are turned into ants. Senbei Noriaki steps on one of the ants thinking it is the monster, while it is Midori in fact.