Story of a group of children's successful efforts to bring to book a gang of oil men intent on stealing valuable invention.
| Actor | Role |
|---|---|
 Frazer HinesKim | Kim |
 Meredith EdwardsPolice Constable Durrant | Police Constable Durrant |
 Peter CopleyMr. Ritter | Mr. Ritter |
 Dorothy GordonMiss Clark | Miss Clark |
 John HorsleyFireman | Fireman |
| CChristopher WarbeyFreddie | Freddie |
| AAli AllenAli | Ali |
 Katherine KathAnita Fox | Anita Fox |
 Paul DanemanProfessor Picton | Professor Picton |
| MMandy HarperPat | Pat |
| DDavid BirdMr. Cook | Mr. Cook |
 Ian WhittakerRupert | Rupert |
| LLee FoxPolice Sergeant | Police Sergeant |
| RRichard MolinasSignor Caspinelli | Signor Caspinelli |
 Arthur MullardWorkman | Workman |