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.

Patrick Troughton
as The Doctor

Anneke Wills
as Polly

Michael Craze
as Ben Jackson

Frazer Hines
as Jamie McCrimmon

Colin Gordon
as Commandant

Donald Pickering
as Blade

Wanda Ventham
as Jean Rock

Pauline Collins
as Samantha Briggs

Bernard Kay
as Inspector Crossland

George Selway
as Meadows