Louise Jameson reads this novelisation of a classic TV adventure for the Fourth Doctor, Leela and K9.

The TARDIS materialises on a spaceship at the edge of the known universe and the Doctor, Leela and K9 encounter a group of astronauts searching for the lost gene bank of the Minyan race. The craft plunges into the heart of a recently formed planet, wherein the Doctor discovers an awesome secret: the descendants of a previous Minyan expedition have become enslaved to a powerful computer!

A dangerous quest leads to a confrontation with the Oracle, at the heart of a fabled crashed spaceship, the P7E.

Louise Jameson, who played Leela in the BBC TV series, reads Terrance Dicks's novelisation of a 1978 serial by Bob Baker and Dave Martin.