BBC Radio 4 Extra will be dipping back into the lost worlds of Doctor Who again next Saturday. Colin Baker returns with Nicola Bryant in a two-part tale originally intended for Season 23, the 14-part Trial of A Time Lord.

Written by Sapphire & Steel creator P.J. Hammond and Andy Lane, Paradise 5 has the Doctor and Peri going undercover at a 35th Century holiday resort. Despite the Trial connection don’t expect to find The Valeyard in this Big Finish drama. Also Peri has subjected Mel to some kind of chronal displacement.

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Paradise 5 will broadcast at 18:00 and again at midnight. It will be available online soon after broadcast.