“The Return”, Exterior Landscape, Refusis

On these albums

Doctor Who: The ArkPaul Erickson and Lesley Scott starring William Hartnell, Jackie Lane & Peter Purves · 2006Soundtrack

Doctor Who: The TV Episodes - Collection SixVarious Artists · 2013

Source: MusicBrainz recording dc8bd0df-b8c4-4dee-b7f4-1f8e8f291b6f (CC0).