Following the demise of his previous band, Tempest, Hiseman announced his plan for a new, as yet unnamed, outfit in November 1974, but only Moore was named as a member.
Among the musicians considered were singer Graham Bell, keyboardist Duncan Mackay and former Colosseum and Tempest bassist Mark Clarke.
The line-up was eventually completed by singer Mike Starrs, keyboardist Don Airey and bassist Neil Murray.
The band was oriented toward jazz fusion, much of which was driven by the guitar work of Moore, leading to a much heavier sound than the original Colosseum.
Plans for a fourth album fell through when Don Airey decided to join Rainbow in December 1978.