Doctor Who and the Armageddon Factor

In 1980, The Armageddon Factor was released as a novelisation by Target Books under the title Doctor Who and the Armageddon Factor.

Cover blurb
Some time ago, the White Guardian, one of the most powerful beings in the Cosmos, had set the Doctor an urgent task - to find and reassemble the six segments of the Key to Time.

The Doctor and Romana had successfully retrieved five of the segments and now they have reached the planet Atrios in the middle of an atomic war, to search for the last, most vital piece.

Sinister dangers await them in this final stage of their quest...

THE ARMAGEDDON FACTORis a novel in the Key To Time Sequence. Also available THE RIBOS OPERATION, THE STONES OF BLOOD, THE ANDROIDS OF TARA and THE POWER OF KROLL.