In 1995 Butler again joined Osbourne's band to perform on the "Ozzmosis" album. After recording "Ozzmosis", he formed G/Z/R, issuing "Plastic Planet" in 1995. His next solo album, "Black Science," followed in 1997. Butler returned to Sabbath once more for the 1997 edition of Ozzfest, and has remained with the band since. In 2005 he released "Ohmwork", his third solo album. In October 2006 it was announced that Butler, along with Tony Iommi, would be reforming the "Dehumanizer"-era Black Sabbath line-up with Vinny Appice and Ronnie James Dio, under the name Heaven & Hell to differentiate between the reunited touring band fronted by Osbourne, and the Dio-fronted version of the band.