During January of 2006 it would be learned that a potential "Supergroup" union was in the works. The unit, conducting rehearsals and songwriting sessions at Drac Studios, owned by the GUNS N' ROSES, THE CULT and VELVET REVOLVER credited drummer MATT SORUM, involved former THE CULT, DOHENY and CAMP FREDDY bassist Billy Morrison, also handling lead vocals, THE CULT guitarist Billy Duffy and former THE ALMIGHTY frontman RICKY WARWICK. Amongst the songs recorded would be cover version of ADAM AND THE ANTS 'Ants Invasion'. In April former FUEL frontman Brett Scallions joined CIRCUS DIABLO as the group's new bassist.

In June CIRCUS DIABLO announced that Jeremy Colson, of APARTMENT 26, DALI'S DILEMMA, MICHAEL SCHENKER GROUP and the STEVE VAI band, had been installed on drums.

The group joined the OZZY OSBOURNE headlined 'Ozzfest' extravaganza for arena dates throughout June and July 2007 across the USA.

Brett Scallions and his former FUEL colleague Jeff Abercrombie forged a union with former BUCKCHERRY guitar player Yogi Lonich and ex-CANDIRIA drummer Ken Schalk during 2009 billed as REFUELED. Scallions also cut a project album under the billing WORLD FIRE BRIGADE.