Dian Fossey left the United States for Africa in December 1966 and began her gorilla studies soon after. While in the central African nation of Rwanda, Fossey fell in love with the species and dedicated her life to ensuring their survival. She became an international icon and renowned primatologist, all while fighting an endless battle against encroaching gorilla poachers. The fight likely cost Fossey her life, though her murder was never definitively solved. The series is filled with Fossey's own observations, recorded in her writings and brought to life by Sigourney Weaver, who has a special connection to Fossey. Weaver won a Golden Globe, and was nominated for an Oscar, for her portrayal of Fossey in the 1988 film "Gorillas in the Mist." Weaver is uniquely placed to recount Fossey's firsthand thoughts and feelings.