Chegwin, who rose to fame on the BBC children's show Multi-Coloured Swap Shop, was so badly injured in a fall on last year's series he had to pull out.
Olympians Beth Tweddle and Luke Campbell are also getting their skates on along with soap stars Samia Ghadie, who plays Maria Connor in Coronation Street, and Matt Lapinskas who played Anthony Moon in EastEnders.
Anthea Turner, Joe Pasquale and former MP Oona King will be joined on the ITV show by Welsh rugby player Gareth Thomas.
The latest show, set to air on January 6, will be presented by Phillip Schofield and Christine Bleakley and also sees the return of sharp-tongued judge Jason Gardiner.
Aussie Gardiner, who famously described watching swimming champion Sharron Davies dance as looking at "faecal matter that won't flush", started as a judge when the show launched in 2006.
He also caused controversy when he was accused of bullying former judge Karen Barber by telling her: "If your opinion still mattered, you'd be on the panel."