When it is put to him "we went to war in Iraq on a lie, and that lie was your lie", he simply replies: "Yes."
US officials "sexed up" Janabi's drawings of mobile biological weapons labs to make them more presentable, admits Colonel Lawrence Wilkerson, General Powell's former chief of staff. "I brought the White House team in to do the graphics," he said, adding how "intelligence was being worked to fit around the policy".
As for his former boss: "I don't see any way on this earth that Secretary Powell doesn't feel almost a rage about Curveball and the way he was used in regards to that intelligence."
Another revelation in the series is the real reason why the FBI swooped on Russian spy Anna Chapman in 2010. Top officials feared the glamorous Russian agent wanted to seduce one of US President Barack Obama's inner circle.
Frank Figliuzzi, the FBI's head of counterintelligence, reveals how she got "closer and closer to higher and higher ranking leadership - she got close enough to disturb us".
The fear that Chapman would compromise a senior US official in a "honey trap" was a key reason for the arrest and deportation of the Russian spy ring of 10 people, of which she was a part, in 2010.
"We were becoming very concerned," he says. "They were getting close enough to a sitting US Cabinet member that we thought we could no longer allow this to continue."
Several British spies also feature in the programme.
BBC veteran reporter Peter Taylor, who worked for a year putting the documentary together, describes them as "ordinary people who are committed to what they do" and "a million miles" from the spies depicted in film.
- Independent