“Mission to the Unknown”, Scene 6, Dalek Control Room

On these albums

Doctor Who: The Daleks’ Master PlanTerry Nation & Dennis Spooner starring William Hartnell, Peter Purves & Adrienne Hill · 2001Soundtrack

Doctor Who: The Lost TV Episodes - Collection TwoVarious Artists · 2011

Source: MusicBrainz recording 047d8174-9411-4c11-8332-b73875b7c711 (CC0).