A Turtle's Shell is a Human's Ribs

Everyone's favorite TV superhero Action Mask shows up in Kasukabe, and he's trying to get something from Shin-chan -- but what could it be?

Something sinister's afoot in Kasukabe. Shin-chan doesn't know what it is, but he's pretty sure it involves samba-dancing doppelgängers.

The Noharas get caught between two rival clans when Himawari swallows a pretty bead that turns out to be a mysterious ball with hidden powers.

The Straw Hats visits an island, known as Mecha Island, where a fisherman sings an old folk song about a Golden Crown. Searching for that mysterious treasure, they find a hidden entrance into the island. The island's leader, Ratchet, impressed with the find and in search of the Golden Crown himself, invites the crew to join him in his search and the crew along with Ratchet and his henchmen enter the cave. As it turns out, the islands true form, is that of a giant turtle. Ratchet, who had known this all along, uses his mechanical castle to take control of the turtle, in order to use it, to take over the world. Now the Straw Hats have to stop not only Ratchet, but also the helpless turtle, from crashing into a nearby island.

A diabolical plot to empower pushover dads causes Shin-chan's father to return home as a robot. The Nohara family bond is about to be put to the test!