Fan Casting Cenozoic Period in My Disney cinematic universe

The Ceolian era was a primitive period in the history of our planet. At this time, dinosaurs had been extinct for centuries, and mammals already reigned on Earth as the dominant species. At some point, when the first humans existed and mammoths walked the Earth, the Earth suffered a climate change subjecting the northern hemisphere to an eternal winter. During this period, in present-day Alaska, a young native named Kenai, seeking to avenge his brother, kills a bear, which will lead the great spirits of nature to take action, transforming him into a bear to teach him a lesson.