June 18, 1989
Miyo-chan says she can't study unless it's quiet. Eiichi and Korosuke create a sweet little home in the sky just for her. But when Butagorilla and others discover it, the peaceful hideout is taken over.
Fed up with Butagorilla's selfish acts, Eiichi builds a "strict justice" device that won't overlook even tiny misdeeds. It works too well, and the punishment starts affecting more than the target.
Eiichi's dad is threatened by criminals! To protect him, Eiichi invents a small bodyguard robot and a "shooting" mic device, then heads out to stop the crooks. But the chase is more dangerous than planned.
It's school observation day, and parents come to class. Somehow Korosuke also shows up with Eiichi's dad! After a clash with Butagorilla's father, rivalries explode during a parent-child baseball tournament.
Korosuke carelessly brings out an invisibility cloak, and Tongari steals it. Invisible, Tongari pulls pranks nonstop. But when the cloak's knots can't be seen, he gets stuck and ends up lonely and afraid.
To meet Thomas Edison, Eiichi builds an improved time machine. While he's away, Butagorilla and Tongari activate it and land in 19th-century America. Lost and reckless, they stumble into dangerous trouble.
Eiichi invents icy "water clay" that can be shaped like modeling clay. The kids use it to cool off and build things for summer fun. But the strange material leads to surprises when their creations go too far.
Korosuke wants to power up like a super robot, but Eiichi says upgrades cost money. Determined, Korosuke starts part-time jobs to earn cash. His clumsy work causes mishaps, but he keeps trying.
Butagorilla complains that a marathon is too long and insists it should be 35 killometers. Eiichi and friends travel to ancient Greece to measure the course and change history. Their plan to rewrite the race hits obstacles.
Eiichi's TV breaks, and Korosuke begs for a new one. When the neighborhood sports day announces a big-screen TV as the MVP prize, everyone gets fired up. Rival teams clash as they compete for the reward.
Eiichi and Ben are forced to attend Butagorilla's party. To survive the food, Eiichi invents a seasoning that makes anything taste like croquettes. The prank works-until flavors get out of control.
Eiichi uses a memorization lamp that boosts memory to ace a language test. Word spreads, and Butagorilla seizes the lamp for himself. Eiichi must get it back before the power is misused.
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