Frans Piët

George and Jimmy time-travel to the 18th century and find themselves on a deserted pirate island where the inevitable buried treasure lies buried.

Sjors and Sjimmie have received a magic ring as a thank you for their help to a well-known archaeologist. They end up in the Middle Ages with their regular opponents, Boris and Pedro, because of the magic ring. The magic ring makes wishes come true, but Sjors and Sjimmie don't know that. They are accused of witchcraft and are in danger of being burned at the stake.

George and Jimmy travel all the way to Taskara. A rich Chinese man wants them to bring back the rare mineral OQ-4. But Taskara is inhabited by giants and, unfortunately, crooks Boris and Pedro are sniffing around too.

Colonel Brulgraag has found the will of King Krijn XXIV of Schiermeeuwen. Whoever finds Krijn's Sword will be the new king. The colonel asks Sjors and Sjimmie to search for the sword so that it can be taken to a museum and not used by Krispijn to gain power.