Ace returns to Perivale to visit her friends, only to find they have been abducted to an alien planet by a race called the Cheetah People who were shown the way to Earth by the Master. The Doctor must find a way off the planet before they all succumb to its savage influence.
| Actor | Role |
|---|---|
 Sylvester McCoyThe Doctor | The Doctor |
 Sophie AldredAce | Ace |
 Anthony AinleyThe Master | The Master |
 Julian HollowayPaterson | Paterson |
 Lisa BowermanKarra | Karra |
 Gareth HaleLen | Len |
 Norman PaceHarvey | Harvey |
 Will BartonMidge | Midge |
 Sakuntala RamaneeShreela | Shreela |
| KKate EatonAnge | Ange |
 David JohnDerek | Derek |
| SSean OliverStuart | Stuart |
| KKathleen BidmeadWoman | Woman |
| MMichelle MartinNeighbour | Neighbour |
 Adele SilvaSqueak | Squeak |