inner was formed in 1980 by Matthias Lasch (a.k.a. Matt Sinner; vocals/bass), who recruited likeminded Judas Priest loving musicians in the form of Wolfgang Werner (guitar), Calo Rapallo (guitar/vocals), Franky Mittelbach (keyboards/vocals) and Edgar Patrik (drums) to feed on imported meals of NWOBHM records to release a set of albums widely dismissed as amateurish during the early and mid 1980s like Wild N' Evil (1985), Fast Decision (1983; with Helmo Stoner replacing Werner and Rapallo), Danger Zone (1984; with Mick Shirley replacing Mittelbach and Ralf Schulz replacing Patrik) before a total line-up modification occurred when Lasch and Stoner hired Hermann Frank and Bernie Van Der Graaf to take over guitar and drums respectively to try again with Touch Of Sin (1985) and Comin' Out Fighting (1986). Andy Susemihl and Armin Mucke then replaced Frank on guitars, while Stoner would be replaced by Mathias Ulmer for Dangerous Charm (1987). By this time, however, their records were still only released in Germany and the record label got fed up and let them loose; the band subsequently split. Lasch would subsequently go on to release a solo album titled Back To The Bullet for BMG Ariola' as Mat Sinner.
When the act reformed in 1992 another set of relatively uninspiring albums resulted on the German Posh' and No Bull' labels including No More Alibis (1992), Bottom Line (1995), Respect (1995), In The Line Of Fire (1996; live) and Judgement Day (1997) before changing to Nuclear Blast' for the much improved The Nature Of Evil (Live In Europe) (1998), The Second Decade - The Best Of Sinner (1999) best of compilation, and The End Of Sanctuary (2000), the 2000 gig featuring a new line-up with Lasch hireing Benny Wolter (ex-Thunderheart; guitar), Alex Beyroth (guitar), Frank Rossler (keyboards) and Uli Kusch (of Helloween; drums), Lasch also sidelined with Primal Fear for a time. The act's popularity was finally on the rise even in their homeland.