Episode Four, Scene 25: Vaughn's Office, I.E. Factory Compound

On these albums

Doctor Who: The InvasionDerrick Sherwin from an idea by Kit Pedler starring Patrick Troughton, Frazer Hines, Wendy Padbury narrated by Frazer Hines · 2004Soundtrack

Doctor Who: The Lost TV Episodes - Collection FiveVarious Artists · 2012

Source: MusicBrainz recording 847afa52-302d-4892-90af-ffba4800d03b (CC0).