“The Return”, The Launcher Refusis & 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 071c14ae-2250-4f10-b1e0-ab9f2dcc0b71 (CC0).