After the departure of founder Daevid Allen the group Gong went through a rapid series of personnel changes with drummer/percussionist Pierre Moerlen becoming the de facto leader. The music evolved away from the psychedelic sound of the Allen-led era into jazz/rock fusion. By the time Expresso II (1978) was recorded Moerlen had assembled an almost entirely different group with a very different sound. With the completion of Gong's contract with Virgin Records the group name was changed to Pierre Moerlen's Gong to differentiate it from the other Gong offshoots and the original band.

In this animated tale, a tiny village is destroyed by a surging glacier, which serves as the deadly domain for the evil Ice Lord, Nekron. The only survivor is a young warrior, Larn, who vows to avenge this act of destruction. The evil continues, however, as Nekron's palace of ice heads straight towards Fire Keep, the great fortress ruled by the good King Jarol. When Jarol's beautiful daughter, Teegra, is abducted by Nekron's sub-human ape-like creatures, Larn begins a daring search for her. What results is a tense battle between good and evil, surrounded by the mystical elements of the ancient past.