Thunder Island is a location that appears in the cartoon show episode "A Long Tale For Grandpa". It is a tropical island that acts as the homeland of a diverse range of fauna and flora, as a well as the Octopian race. The island is home to the playful Meek Meeks, the vicious Grundels, and the booming Thunder Tree which is the likely source of the island's name, as it is always making loud thunderous sounds with its roots.