Pongo is a young & mischievous gorilla living in the mountains of Africa. He wants to grow up to be brave & clever like his dad, & perhaps even become leader of the pack one day. But it is not until his little sister, Whoopsie, is born that Pongo discovers that growing up isn’t just about having a big chest to thump! Can he prove that he isn’t as young & irresponsible as everyone thinks?