First broadcast: on BBC Radio 4 ExtraLatest broadcast: on BBC Radio 4 Extra
The Time Lord, Tegan and Turlough are reunited with Nyssa, who is on a mission to discover an anti-virus. Fifth Doctor adventure stars Peter Davison and Sarah Sutton.
First broadcast: on BBC Radio 4 ExtraLatest broadcast: on BBC Radio 4 Extra
The time travellers learn more about the base's crew and the planet's only species. But which is deadlier? Fifth Doctor adventure stars Peter Davison and Sarah Sutton.
First broadcast: on BBC Radio 4 ExtraLatest broadcast: on BBC Radio 4 Extra
The shocked Time Lord realises how the base's computer will affect all of their fates, present and future. Fifth Doctor adventure stars Peter Davison and Sarah Sutton.
First broadcast: on BBC Radio 4 ExtraLatest broadcast: on BBC Radio 4 Extra
With the base facing destruction, the Time Lord and his companions battle to secure the anti-virus. Fifth Doctor adventure stars Peter Davison and Sarah Sutton.
