Eleven-year-old Julian Calendar thought changing schools would mean leaving his "nerdy" persona behind, but instead he forms an alliance with fellow inventors Greta and Ben and works with them to prevent an adult from using one of their gadgets for nefarious purposes.

Among other adventures, inventor Senbei Norimaki's young robot creation Arale endangers the police again, Arale and Gatchan are kidnapped by a bank robber, and an alien arrives in Penguin Village hoping to become a superhero.

Dr. Slump goes silent when Senbei gets trapped in a nightmare about poop. Then, Dr. Mashirito creates the world's strongest robot only to discover that Arale is still stronger.

Senbei Norimaki and his precocious robot try to help the police stop a horrible one-eyed monster that is threatening Penguin Village, but his efforts to do more harm than good.

Inventor Senbei Norimaki and his precocious robot, Arale, try their hand at law enforcement and love with disastrous results. And, Arale tries to help when Peasuke falls in love with a tall sixth grader.