The Insect Grower

At night, Doraemon realized that Nobita secretly went outside to search a beetle. Tomorrow, he used it to fight with Yasuo's. Suddenly, Suneo intervented by placing his beetle and it beat Nobita and Yasuo's beetle, making them mad. He showed how big it is and then brought it home. Jealously, Nobita tried to feed his beetle in home, hoping it to grow quick. Seeing it, Doraemon pulled out the insect grower and explained it.

Doraemon placed the beetle on it, he thought it'll grow instantly, then he frowned. It turns out that he have to wait patiently. At dinner, he asked about allowance of petting a beetle, his mom agreed. Then, he happily watches his beetle grow. Tomorrow, the beetle had escaped. It turns out that it hid on Doraemon's back, Nobita happily took his large beetle and started the fight with Suneo. Realizing it was too large, Suneo cancelled the fight and furiously went away.

After that, they started looking at Nobita's large beetle. When Gian touched it, it eventually bit him stronger than a normal beetle. Because of that, he dueled it and lost immediately. Shizuka got curioused about it, so Doraemon showed the gadget and gave it to everyone. Suneo secretly took one. After dinner, his mom eavesdropped their conversation and thought Nobita had a cat or dog.

She quickly went to his room and he showed the beetle, proving her was wrong. In his room, Suneo wanted to feed his beetle, but the pudding was gone, his cat actually brought it downstairs. Tomorrow, Nobita and Doraemon go for a walk with his beetle. Suddenly, Shizuka's butterfly came to them. Then, Yasuo came flying with his dragonfly. Then, Haruo came with his beetle to show. Then, Yamada showed his cricket. But it all shows bad effects, so Doraemon used the multi-purpose trap.

They already trap everyone's insects, except Gian's. When they came to his house, they saw he tried to fight with a giant praying mantis. When Doraemon tried to trap it, the mantis took it before he could. Nobita tried to took the trap back, but got saved by his beetle on Doraemon's back that jumped to save him. The mantis hit his beetle and immediately lost. They finally can trap all of the insects. Soon, Nobita decided to place his beetle back to its origin.

Almost night, Suneo found out that many grown ants took so much snacks and foods from his home because of they ate the opened pudding that got brought by his cat to his backyard.