This is not a surprise, as the vocalist on his first album (Plastic Planet) was Burton C. Bell from Fear Factory,[2] who is known for more driving and harder edged vocals than ever was displayed in Black Sabbath.

Before taking on Bell as vocalist for the debut album Plastic Planet, Butler contacted Devin Townsend to perform vocals.

However, due to Townsend's recent stint with Steve Vai, where he had not been a lyricist, he was unwilling to enter into another band where he would have no lyrical input.

This proved to be a one-time collaboration as Frasca was replaced by Clark Brown from the band Symatic for GZR's second album, Black Science, released in 1997.

Castronovo was replaced on drums by Chad Smith (not to be confused with the Red Hot Chili Peppers drummer with the same name).