We turn to our abc news exclusive on lance armstrong. We hear him open up and tell all about his drug use and his lies, in real-time. Documentary filmmakers given unrestricted behind-the-scenes access... See More
We turn to our abc news exclusive on lance armstrong. We hear him open up and tell all about his drug use and his lies, in real-time. Documentary filmmakers given unrestricted behind-the-scenes access as the scandal's unfolding. Neal karlinsky has the story. Reporter: It's the first glimpse at lance armstrong since he confessed to a career fueled by doping. His endorsement, his own cancer foundation. I think about it's living a lie. I didn't live a lot of lies. But I lived one big one. You know, it's different, i guess. Reporter: In the astonishing up close and personal documentary, the armstrong lie, the former champion looks shell-shocked at times. I certainly was very confident that I would never be caught. Reporter: Oscar-winning filmmaker alex gidny traveled the world with armstrong. First, to make a feel-good story about the champion. This fairy tale just goes on and on. Reporter: That plan was scrapped as armstrong's life came unglued. But he had armstrong's trust and was there to capture a completely different story as it unfolded. This is a guy who is used to winning. And I think you can see the defeat in his physical posture. And also, a real vulnerability, which is very unusual for lance. Life, for me at the time, was moving fast. Look at 2005. I had won seven tours in a row. I was engaged to a beautiful rock star. I was -- that all just felt normal to me. Reporter: The film won't be released until november. Abc news was given exclusive advanced clips, just armstrong faces more bad news. A judge has ordered that he must finally testify under oath about exactly how he cheated, as part of a multimillion-dollar civil suit. "The armstrong lie" coming to a big screen and a courtroom. A story far from its final chapter. For "good morning america," neal karlinsky, abc news, seattle.
This transcript has been automatically generated and may not be 100% accurate.