Kai Hansen formed Helloween in 1984, playing guitar and singing on the speed metal band's first four albums. He left in early 1989, however, and founded Gamma Ray with vocalist Ralf Scheepers (formerly with Tyran Pace). The duo intended to record a one-off project that Hansen originated while in Helloween, so they recruited bassist Uwe Wessel, drummer Matthias Burchardt, and several other musicians…