The title is the name of the fictional independent research organisation featured in the series, a freelance scientific consultancy which is called in to provide scientific investigators and troubleshooters in a wide range of situations, including pollution, forgery, mining, conservation, and the recovery of a lost satellite.
[1] The series focusses on the exploits of one of Delta's mobile laboratories, and initially featured three lead regular characters, investigative scientist Jeff Mallow (John Gregg), his assistant Inger Petri (Kirrily Nolan) and science specialist Brian Fitch (Kevin Miles).
A fourth regular character, scientist Jackie Stuart (Patsy Trench) was added for the second season.
The series was one of the first major in-house productions from the ABC's recently established Drama Unit.
It broke new ground in Australian TV drama as the first local series to cover topical issues like pollution and conservation from a scientific and investigative viewpoint.