Karl investigates how we should spend out limited time on the planet as he finds out what he will be like as an old man.

As Karl explores the impact of waste on our planet, he meets a roadkill chef, as well as a man who has found a unique use for old bottles.

Karl discovers the alleged benefits of 'urine therapy' as he explores the lengths people go to in order to stay healthy.

Karl meets a group of vigilante superheroes in San Diego as he goes in search of people with unique attitudes towards life.

Karl tries on toupées and slips into ladies' clothes as he explores the factors that shape our identity.

Karl Pilkington goes back on the road in search of the answers to more of life's big questions, beginning by heading to America to consider the point of art. He meets artists who make sculptures out of dog muck, attempts to create a masterpiece from his own vomit and strips down to his pants for a spot of performance art in Times Square.