After disappearances during an archelogical dig, Stella Grant (Carole Ann Ford) sends in her two top agents, played by Colin Baker and Wendy Padbury, to investigate.
| Actor | Role |
|---|---|
 Colin BakerGalico | Galico |
 Wendy PadburyMimi Keel | Mimi Keel |
 Carole Ann FordStella Grant | Stella Grant |
| MMarc DanburyThe Form | The Form |
 Erich RedmanRyle | Ryle |
| SSara-May BrennanDr. Pauls | Dr. Pauls |
| TTara-Louise KayeAnnie | Annie |
| SSteve DineenDr. Morton | Dr. Morton |
| PPaul BryanDr. Marsh | Dr. Marsh |