Zac Efron and superfoods expert, Darin Olien, travel the world in search of the secrets to good health, a long life, and a higher level of eco-consciousness -- adventure, laughs and goat-milking ensue. "Down to Earth" is a binge-worthy travelogue, food odyssey, and eco-warrior series that takes the star out of his comfort zone and into the far corners of the world.