Doctor Who and the Underworld

First published by Target Books in 1980, written by Terrance Dicks, and based on the 1978 serial Underworld

Exploring the very edge of the known universe, the Fourth Doctor, Leela and K9 discover a group of astronauts searching for the lost gene bank of the Minyan race. During the perilous voyage, the astronauts' craft plunges into the heart of a recently formed planet, wherein an awesome secret is hidden.

How will the Minyan quest end?

What must the Doctor wrest from the Heart of the Oracle?

[Publisher's summary]

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