First edition.
127 pages, plus 1 page coupon for information, free Target badge and Target prize draw.
Cover by Bill Donohoe.
ISBN 0426201035 is on the copyright page.
Novelization of the 1979 serial written by Bob Baker and Dave Martin.
This book is the sixth, and final segment of The Key to Time storyline. The other five being "The Ribos Operation", "The Pirate Planet", "The Stones of Blood", "The Androids of Tara" and "The Power of Kroll".
A Target Book.
Published by the paperback division of W. H. Allen & Co. Ltd.
A Howard & Wyndham Company.