Venerated actor James Earl Jones narrates George Casey's stunning documentary that explores the daily life and rhythms of the planet's best-known wildlife sanctuary: East Africa's Serengeti National Park. The film's highlight is the great annual migration -- a spectacle few humans have witnessed -- during which more than 2 million wildebeests, zebras and antelope travel 500 miles from the southern plains to the Masai Mara Game Preserve in the north.