Eternal, A1 and Damage will appear in the new series of 'The Big Reunion'.
The ITV2 reality show has already helped to relaunch the careers of Blue, Atomic Kitten and Liberty X, and after the programme became a huge success, the acts headed out on tour.
Gareth Gates, Adam Rickitt, Kavana, Another Level's Dane Bowers and Blazin' Squad's Kenzie, will also form a supergroup for the new series, 5th Story.
Jade Jones from nineties boy band Damage, who is married to former Spice Girl Emma Bunton, confessed: "Lots of things were swept under the carpet."
Band mate Andrez Harriott explained the band's downfall and admitted: "Drugs came in, that's when it went wrong."
While Rahsaan J Bromfield revealed he never wanted to see his school friends again.
He said: "You could see the punches being thrown left right and centre. (I said to the band) 'Don't call me I don't want anything to do with you again'."
Also joining the acts will be pop groups 3T and Girl Thing and
revelations include Adam Rickitt's candid memories of his depression and bulimia.
He admitted: "I used to make myself sick up to 20 times a day."
Gareth Gates talks about his relationship with former glamour model Katie Price and Dane Bowers reveals how his life was affected by allegations of sexual assault.
Louise Rednapp, former lead singer in Eternal, is not likely to return to the show to join ex-band mates, Easther Bennett, Vernette Bennett and Kelle Bryan.
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