Phil Anselmo (ex-Pantera, Down), Joey Belladonna (Anthrax), Max Cavalera (Soulfly, ex-Sepultura) and Udo Dirkschneider (UDO, ex-Accept) will front the band on a tour of South America in November, Team Rock Radio reports.
They'll be joined by Jon Donais, Brian Fair and Matt Bachand of Shadows Fall, Jasin Todd of Shinedown and Aaron Rossi of Ministry. The band will be named the Metal Allstars.
And more names are set to be announced for the trip, which will raise funds for the charity Ride for Dime, set up in memory of murdered Pantera guitarist Dimebag Darrell.
Cavalera says: "I'm so proud to announce the coming of the supergroup. We're going to have great fun and there's going to be amazing metal. Everybody knows I love collaboration this one's going to be exceptional."