The documentary will see former Westlife star McFadden, former Take That singer Robbie Williams, as well as members of other groups including East 17, Five, Damage and 911, speak about their own experiences of early fame.
Huge figures from the industry will also feature on the series, including Simon Cowell, Westlife manager Louis Walsh, Take That creator Nigel Martin-Smith. Managers of Blue, Five, and 911 will also contribute.
"I couldn't be more thrilled about this series. An epic story featuring a cast of stars and star-makers, spanning three decades, it involves some of the icons of modern British pop", Theroux said. "We see them through them their highs and lows, hearing from the key players, as we chart the golden years of boybands".
He continued: "How they came together, the experience of sudden fame, the opportunity and temptations that came their way, conflicts within the groups, between the groups, and between the boys and their managers".
"It’s a gripping fable about getting everything you dreamed of, and it not being what you imagined, centred on a generation of young men, and their managers, who were wildly successful and also immensely vulnerable, having the times of their lives and also in some cases cracking up".
"Those boys we all watched singing and dancing in tight formation – Take That, East 17, Westlife, Blue, Five, Damage, 911 and so many others – are now middle-aged men who have the time and the maturity to look back and reflect on what they went through".
"It’s taken us more than a year to make the series. Now I’m just excited for people to see it".
The documentary which is titled Boybands Forever, will be coming to BBC Two, directed by Louis Theroux and his wife Nancy Strang, via his company Mindhouse Productions.
Head of BBC popular music TV, Jonathan Rothery had this to say.
"It feels like yesterday but the Brit boy band era began 35 years ago, and what a fascinating moment in time and pop culture it was", he said.
"The series will take us on a trip down memory lane but will also enlighten us, that behind the singing, dancing, double denim and bright smiles were a heck of a lot of blood, sweat and tears".
