Long ago, as the Earth was emerging from the Ice Age, there were three brothers. After a bear takes the life of the oldest brother, impulsive youngest brother Kenai kills the bear in revenge, only to be transformed into a bear himself. Denahi, the middle brother, comes upon this bear and, thinking it killed Kenai, vows revenge. Now brother hunts brother and Kenai s only hope for survival is to befriend his own worst enemy, a grizzly cub named Koda. Koda main goal is to show Kenai the real meaning of brotherhood.