Gareth Gates, Another Level's Dane Bowers and former Coronation Street star Adam Rickitt are to form a supergroup for the new series of The Big Reunion.
The lads will join forces with Kavana and Blazing Squad's Kenzie to form boyband 5th Story for the reality series.
Also confirmed by ITV2 to appear on the show are Damage, 3T, A1, Girl Thing and Eternal, who will reunite without member Louise Redknapp.
Louise, who is married to footballer Jamie Redknapp, quit the band, who notched up 15 top 20 hits, to go solo in 1995.
Eternal's Vernette Bennett said: "We have a band member who doesn't want to be there. What do you do with that?"
Kelle Bryan added: "We never communicated. It festered into something very ugly."
Boyband 3T will discuss how coming from the Jackson dynasty could be a curse and Damage are expected to open up about brawls and drugs.
Adam Rickitt talks about suffering from depression and bulimia, Gareth Gates will discuss his infamous relationship with Katie Price, Dane Bowers talks about allegations of sexual assault and Kavana confesses to drug "binges".
The show returns next year with eight episodes, followed by a 15-date arena tour in May.
Boybands Five and Blue, Atomic Kitten and Liberty X previously took part in the show.