When British Intelligence, following a series of experiments designed to increase alertness of long-distance lorry drivers through use of tonal repetition, discovers chordation that completely erases all memory, it is obvious that such a cleansed mind may be programmed to perform any type of action. Erstwhile agent Peter Clarke inactive for years, is chosen as courier to transport an audio tape of the tones to his native Australia.
| Actor | Role |
|---|---|
 John WatersNot listed | Not listed |
 Belinda GiblinNot listed | Not listed |
 Vincent BallNot listed | Not listed |
 Keith LeeNot listed | Not listed |
| TTracy LeeNot listed | Not listed |
| DDon BurrowsNot listed | Not listed |
| GGeorge GollaNot listed | Not listed |
| PPaul JansenNot listed | Not listed |
| PPaul BakerNot listed | Not listed |
 Tony BarryNot listed | Not listed |
| AAllan PenneyNot listed | Not listed |
| WWilliam RedmondNot listed | Not listed |
 Paul ChubbNot listed | Not listed |
| MMercia Deane-JohnsNot listed | Not listed |
| WWallas EatonNot listed | Not listed |
| DDonald MacDonaldNot listed | Not listed |