By 1978, the BBC had wiped the colour videotape masters of all but Episode Four, although monochrome film recordings made for export survived for all episodes.
In that year, Ian Levine asked a friend to record the programme from a broadcast by KCET TV in Los Angeles, U.S.A. using a Betamax VCR.
In 1992, the serial was recoloured in a complex process involving the combination of the colour signal from copies of these tapes (and another fan recording, used to bridge a gap when tapes were changed during brodcast) with the luminance signal from the monochrome film recordings. For a full account of the restoration, see the Restoration Team Website.
This recoloured version was first broadcast on BBC 2 between 20 November and 18 December 1992.