Mysteries of Energy! Boom! (GoGo! #7)

When their airplane has to make an emergency landing, Yang-pa and her family find themselves stranded on a deserted island. They meet an unusually strong boy named Dudu and a talking gorilla named Papa. Looking for a way to get off the island, they find a strange cave with an electric fence around it. It seems that someone is experimenting with energy on the island… Will Yang-pa and her family make it back home safely?