Diego, the energetic, nature-loving 8-year-old cousin of Dora the Explorer, is back with another round of exciting adventures, traveling from one end of the globe to the other in search of animals in need of a helping hand. Just before he's named the new King of the Mountain, a baby gorilla wanders off into the jungle and gets himself lost. Now, it's up to Diego to locate the little primate and return him to his throne.