Buck is a domestic dog taken from his home and sold as a sled dog in Alaska, where he must learn to survive and adapt to the harsh wilderness. He is eventually rescued by John Thornton, a man who saves his life. Simba is the son of Mufasa, the king of the jungle, but is tricked by his uncle Scar into thinking he caused his father's death. Simba runs away as a cub but later returns as an adult to challenge Scar for the throne.