“The Return”, Main Deck, The Ark

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 814f3041-2f28-40d0-ad18-5cd3fedc607d (CC0).