The Evil Prince

Kion, a young lion and the son of Zira, was taken from his family by Simba's pride when he was just a small cub. Simba took him because he wanted to protect him from Zira, her evil lionesses and, of course, Scar. But why didn't Simba take the other cubs, Vitani, Nuka and Kovu? And what happens when Kion starts to behave more like his father, Scar?