Mr. Copy is the 79th chapter of the Dr. Slump manga.
Summary[]
Senbei Norimaki agrees to go with Arale Norimaki and Gatchan to the amusement park. Shortly after, he receives an invitation from Midori Yamabuki to go to the cinema the same day. He spends all night creating Mr. Copy, a camera that allows the user to create several copies of them, and uses it to create a copy of himself. While arguing with his clone over who will go to the cinema with Midori, Arale and Gatchan use the machine and the Norimaki Residence ends invaded with hundreds of Arale and Gatchan. Meanwhile, Midori is angry, still waiting for Senbei in front of the Penguin Village Movie Theater.