|Dr. Slump & Arale-chan episode|
|Airdate:||November 23, 1983|
|Japanese Title:||ガッちゃん ガッちゃん|
|Previous:||There is a Placement Test|
|Next:||Yay! Bori Bari Bori Bari|
Gatchan Gatchan is the 134th episode of Dr. Slump and Arale-chan.
Residents of Penguin Village awaken to find that many of objects have either gone missing, or are missing large components (e.g. - a car with only tires left behind). After the initial chaos and confusion, the reason behind the missing items is revealed when a sleepy Gatchan returns home and spins a cocoon in his/her sleep.
Senbei (with the help of the narrator) deduces that Gatchan is like a caterpillar and needed to eat a very large amount of food before a metamorphosis would begin. Senbei and Midori speculate what Gatchan will look like after his/her transformation, and periodically study the cocoon as it incubates. After 15 days, Arale alerts Senbei and Midori that the cocoon is about to hatch, and the three gather around to watch. When Gatchan emerges from the cocoon, they are surprised that he looks exactly the same as before. They are again surprised and realized that the cocoon was not a method of metamorphosis, but a method of asexual reproduction, as a second, identical Gatchan emerges.