The Doctor and his friends Ben, Polly and Jamie arrive at Gatwick airport. They quickly stumble upon an alien plot, centring upon the mysterious ‘Chameleon Tours’ - a low-price holiday company, whose young passengers have been vanishing in unexplained circumstances. The Doctor investigates further, but it isn’t long before his own friends start disappearing too.
| Actor | Role |
|---|---|
 Patrick TroughtonThe Doctor (voice) | The Doctor (voice) |
 Anneke WillsPolly (voice) | Polly (voice) |
 Michael CrazeBen (voice) | Ben (voice) |
 Frazer HinesJamie (voice) | Jamie (voice) |