For 27 years, the world of Ivan the gorilla was a dull cage in a roadside shopping mall. But when he meets Ruby, a baby elephant captured in the wild, Ivan's ambitions and imagination must grow to meet the challenge of rescuing his endangered new companion. Aided by Bob the scrappy dog and a young human ally, Ivan sets out to become the great silverback and protector he was always meant to be. Enter the mind of a remarkable hero in this unforgettable story of enduring friendship, drawn from true events. Based on the 2012 book by Katherine Applegate, a #1 New York Times bestseller and winner of the Newbery Medal.