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.
| Writing | Rona Munro | Writer |
| Directing | Alan Wareing | Director |
| Production | John Nathan-Turner | Producer |
| Art | Nick Somerville | Production Design |
| Sound | Les Mowbray | Sound |
| Crew | Paul Heasman | Stunt Coordinator |
| Costume & Make-Up | Ken Trew | Costume Design |
| Writing | Andrew Cartmel | Script Editor |
| Crew | Dick Mills | Special Sound Effects |
| Crew | Tip Tipping | Stunt Coordinator |
| Crew | Tip Tipping | Stunt Double |
| Editing | Hugh Parson | Editor |
| Costume & Make-Up | Joan Stribling | Makeup Artist |
| Sound | Dominic Glynn | Original Music Composer |
| Sound | Scott Talbott | Sound |
| Art | Oliver Elmes | Graphic Designer |
| Production | Gary Downie | Production Manager |
| Camera | Paul Harding | Camera Operator |
| Visual Effects | Malcolm James | Visual Effects Designer |
| Camera | Alan Jessop | Camera Operator |
| Lighting | Ian Dow | Lighting Director |
| Visual Effects | Dave Chapman | Visual Effects |
| Production | Valerie Whiston | Production Assistant |