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.
Follows Jack through daily five-mile runs, six-hour training sessions, fasting and enemas during an intense stay at a sweltering Muay Thai boxing camp near Bangkok.
Kelly Osbourne visits her brother in Spain to watch him risk his life running with the bulls in Pamplona. Jack also confronts his tear-inducing phobia of heights during a training session in the French Alps.
Tensions mount as Ozzy and Sharon watch their son quiver his way up the jagged rockface of California's El Capitan mountain.