Grandpa takes his Grandchildren on an adventure through the swamp and into a magical land called, Rainbow Island. During their adventure they learn of many more of these magical lands out there waiting to be explored and meet many new and exciting creatures like Zulo from New Eeland with the body of an eel and the legs of a crab, and the twins from Twinland who enjoy pulling a good prank. When the children go home they can hardly contain their wild imaginations of all the new and exciting places they will go and creatures they will meet when they return.