Something terrible happens in Plant Town! Wall-nut is able to transform into a Tyrannotitan after eating a strange fruit!

Torchwood discovers from his scientific records that a Plant scientific research team discovered a dinosaur fruit under the ice sheet in the North Pole many years ago. So Peashooter, Red Stinger and Wall-nut travel to the North Pole to find out more about this fruit.

Unexpectedly, there is a hidden world in the Arctic underground: warm sunshine, dense forests, strange creatures, giant vines and many more there. With the help of Caudipteryx and Minmi, the Plants arrive at the sky tower to search for a special type of spring water, hoping that it can get rid of Wall-nut’s transformation ability.
So what mystery is stored in the sky tower? And what is the significance of the Tyrannotitan fruit? Read this book and start a great polar adventure with the Plants and dinosaurs.