Jack Osbourne, from the world's most famous TV family, is on a mission. He wants to take on one of the planet's most extreme rock climbing challenges - El Capitan in Yosemite National Park. There is a small snag - Jack is virtually a complete novice at climbing, unfit and overweight! Watch Jack's transformation from celebrity brat to rugged man as he prepares for a journey few people would dare. Jack travels the globe to get in shape and test his nerve. In the process, he attends the world's toughest Thai kick boxing school in Thailand, undergoes a savage course of colonic irrigation, gets chased by wild bulls and goes cave-diving. This fast-paced, thrilling and intimate three-part series features in-depth interviews with Sharon, Ozzy and Kelly Osbourne.