Third printing of second impression, (fourth printing).
First edition 1975.
Reprinted 1976, 77.
142 pages, plus 1 page advertising other Doctor Who books and 1 page about Wyndham books.
Cover by Alun Hood. Interior illustrations by Alan Willow.
Novelization of the 1973 serial by Robert Sloman.
A Target Book.
Published by the paperback division of W. H. Allen & Co. Ltd.
A Howard & Wyndham Company.