The TARDIS arrives on Earth in July, 1966, on a runway at Gatwick Airport. Polly witnesses a murder in a nearby hangar and is then kidnapped by the perpetrator, Spencer of Chameleon Tours. Ben also vanishes. The Second Doctor and Jamie are left to convince the sceptical airport Commandant there has been foul play.
| Actor | Role |
|---|---|
 Patrick TroughtonThe Doctor | The Doctor |
 Anneke WillsPolly | Polly |
 Michael CrazeBen Jackson | Ben Jackson |
 Frazer HinesJamie McCrimmon | Jamie McCrimmon |
 Colin GordonCommandant | Commandant |
 Donald PickeringBlade | Blade |
 Wanda VenthamJean Rock | Jean Rock |
 Pauline CollinsSamantha Briggs | Samantha Briggs |
 Bernard KayInspector Crossland | Inspector Crossland |
| GGeorge SelwayMeadows | Meadows |
| GGilly FraserAnn Davidson | Ann Davidson |
 Victor WindingSpencer | Spencer |
| CChristopher TranchellJenkins | Jenkins |
| PPeter WhitakerInspector Gascoigne | Inspector Gascoigne |
| BBarry WilsherHeslington | Heslington |
| MMadalena NicolNurse Pinto | Nurse Pinto |
| LLeonard TrolleySupt. Reynolds | Supt. Reynolds |
| JJames ApplebyPoliceman | Policeman |
| BBrigit PaulAnnouncer | Announcer |
| MMichael LadkinRAF Pilot | RAF Pilot |