Doctor Who and the Underworld

In 1980, Underworld was released by Target Books under the title Doctor Who and the Underworld.

Cover blurb
Exploring the very edge of the known universe, the Doctor, Leela and K9 discover a group of astronauts searching for the lost gene bank of 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?

Cover blurb
Exploring the very edge of the known universe, the Doctor, Leela and K9 discover a group of astronauts searching for the lost gene bank of 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?

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 * The18thdoctor