The Armstrong Lie: Cyclist defiant before comeback
17 October 2013 Last updated at 20:46 BST
Four years after he won the Tour de France a record-breaking seventh time, Lance Armstrong decided to return to the sport.
In 2009, he tried to win it again with the Astana team and allowed award-winning documentary maker Alex Gibney to follow him.
The American cyclist had faced doping allegations for some time and he had always denied them - furiously. In an interview with Gibney shortly before the start of his comeback Tour, he sounded more defiant than ever.
"I know what I did and did not do. I sleep at night. I am one of the greatest riders at all time."
Clip from The Armstrong Lie, a Sony Pictures documentary.