This edition varies from the fifth Target edition in recommended retail price and that the "second impression" note was removed.
Cover art by Chris Achilleos.
ISBN 0426113241
DOCTOR WHO lands his space-time machine Tardis on the cold, craggy planet of Vortis. The Doctor and his companions, Ian and Vicki, are soon captured by the ZARBI, huge ant-like creatures with metallic bodies and pincer claws; meanwhile Barbara falls into the hands of the friendly MENOPTERA who have come to rid Vortis of the malevolent power of the ZARBI...
'They're well-written books - adventure stories, of course, but with some thought... the creation of the character of the Doctor had a touch of genius about it.' Westminister Press