“Mission to the Unknown”, Scene 16, Dalek Conference 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 6a612ee6-74df-4166-81f1-406c56c1d3e2 (CC0).