The Doctor and Jo find themselves trapped inside an alien peepshow machine which showman Vorg and his assistant Shirna have brought to amuse the populace of the planet Inter Minor. Can they escape Vorg and the ferocious Drashigs?
| Actor | Role |
|---|---|
 Jon PertweeThe Doctor | The Doctor |
 Katy ManningJo Grant | Jo Grant |
 Leslie DwyerVorg | Vorg |
 Cheryl HallShirna | Shirna |
 Tenniel EvansMajor Daly | Major Daly |
 Ian MarterJohn Andrews | John Andrews |
| JJenny McCrackenClaire Daly | Claire Daly |
 Peter HallidayPletrac | Pletrac |
 Michael WisherKalik | Kalik |
| TTerence LodgeOrum | Orum |