• Dave Walker (replaced Ozzy briefly in 1977 for one TV performance)

• Ian Gillan (ex-Deep Purple, vocals on 1983's Born Again)

• Glenn Hughes (ex-Deep Purple, vocals on 1986's Seventh Star)

• Don Airey (ex-Rainbow and Hammer keyboardist, played on Never Say Die)

• Vinny Appice (Tony Iommi look-alike, drums on Mob Rules, Live Evil, Dehumanizer, and several '90s reunion tours)