Formed in 1975, the group originally consisted of lead vocalist Peter Richard, guitarist Tommy Kiefer, bassist Remo Spadino and drummer Chris von Rohr.
[2] Richard left shortly after the band's first live show in September 1975, at which point Kiefer took over primary lead vocal duties and Hansi Droz was brought in as a second guitarist.
[1] For the tour in promotion of Pain Killer on December, Paul Bierk was brought in to take over on lead vocals, von Rohr switching to bass guitar.
[7] Shortly after the release of Hardware early the next year, the guitarist left permanently due to an ongoing heroin addiction, and Meyer remained as his replacement.
[8] By the beginning of 1982, however, Meyer had been left Switzerland to relocate to the United States and form Cobra, and was replaced in Krokus by Mark "Koki" Kohler.
[10] After the release and promotion of 1982's One Vice at a Time, Freddy Steady left Krokus and was replaced by American drummer Steve Pace, the first non-European member of the group; when asked the following year about the lineup change, Storace claimed that it was made due to "musical direction and technical ability".
[1] In early 1987, Krokus parted ways with Keiser and Klaven, with frontman Mark Storace claiming that the former "just wouldn't work hard enough and lacked the musical depth we were looking for", and that the latter had become "fed up with touring".
[19] Storace and von Arb were replaced by Björn Lodin of Baltimoore and Crivelli's former Killer bandmate Many Maurer, respectively, although by early the next year the group had disbanded entirely.
[20] In early 1994, von Arb (back on guitar) reformed Krokus yet again, retaining Maurer on bass and reuniting with vocalist Marc Storace, rhythm guitarist Mark Kohler and drummer Freddy Steady.
[22] In spring 1999, Fernando von Arb reformed Krokus for a third time, retaining Many Maurer on bass and adding lead vocalist Carl Sentance, rhythm guitarist Chris Lauper and former drummer Peter Haas.
[25] With his return, the frontman brought solo band members Dominique Favez on rhythm guitar and Patrick Aeby on drums to Krokus.