Thirty years ago, Will Smith was mesmerized by a photo of the incredible wildebeest migration across the Serengeti in a National Geographic magazine. Now he visits those same wildebeests and discovers an amazing survival strategy.

On the trail of tiger sharks in the Pacific, Will explores the power of smell. For humans, the sense of smell triggers deep memories and emotions, but it has an even more vital function in the animal world.

Will Smith and polar explorer Dwayne Fields are dropped by helicopter in the middle of an Icelandic glacier to allow will to confront his fear of nature by travelling down powerful white water rapids.