The Swiss outfit Krokodil from Zurich was founded in late 1968 by Düde Dürst (drums) and Hardy Hepp (violin, piano, vocals). Together with Walty Anselmo (guitar, sitar, vocals), Mojo Weideli (harmonica) and the Englishman Terry Stevens (bass, vocals), they soon became highly sought-after as a live band, particularly in Germany, and earned plenty of acclaim as the support act for Pink Floyd, Uriah Heep and Free, or alongside Amon Düül II, Can and Guru Guru. This, along with a number of self-produced demo recordings, led to a record deal with the German branch of the multinational US label Liberty. They recorded their eponymous debut album in May 1969 at Trixi Tonstudios in Munich, produced by Siegfried E. Loch, the German manager of Liberty/United Artists.

With their blues-oriented, at times hard rock sound, spearheaded by Weideli’s harmonica and featuring various progressive overtones through the use of piano, violin and sitar, as well as gentle folk passages, they gained international recognition. Nevertheless, sales figures for the LP, released in December 1969, were disappointingly low. After another album, Hardy Hepp left the band to pursue a solo career and with An Invisible World Revealed they created an LP that established them as the leading and best progressive rock band from Switzerland. Their eponymous debut album, designed by Düde Dürst and released exclusively in Germany in 1969, is now extremely rare as a Liberty original.