An expedition sets out to discover what has happened to a lost colony on a distant planet. Amongst the scientists is a teenager raised to be a kind of human computer, able to make connections between different specialisms.
Length 58 minutes
Clive Endersby | John Meillon | Bill Nagy | David Knight | Burt Kwouk | Roger Croucher | Tenniel Evans | David Sumner | Peter Diamond | John McArdle | Keith Peacock | Tim Condren