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Pages 128
ISBN 0-426-19337-6
Publication date

18 August 1983





A group of palaeontologists have been savagely attacked while carrying out a study of a fossilised cave system on twenty-fifth-century Earth.

A party of troopers and Professor Kyle, the only survivor of the attack, are investigating the death of her colleagues when they discover the Fifth Doctor and his companions at the site of the massacre. The time-travellers are immediately suspected.

In trying to establish their innocence and find out who-or what-was responsible for the killings, The Doctor is confronted by an old enemy..





  1. Shadows
  2. Labyrinth of Death
  3. Uneasy Allies
  4. A Crisis Defused
  5. Stowaways
  6. Monstrous Awakenings
  7. A Siege
  8. War of Nerves
  9. Accidents Happen
  10. Triumph and Tragedy


  • The entranceway to the caverns is described as a gigantic human skull with the dark openings of caves gaping like empty eye-sockets and nostrils.
  • The effect of the Earthshock bomb planted in Professor Kyle’s archaeological site is said to be enough to blow the entire planet apart should it be planted at the focal point of several geological fault lines.
  • The sudden and unexplained reactivation of the Cyber-Leader’s secondary garrison is explained away in the novelisation as a side-effect of the secret passageway to the Cybermen’s makeshift control centre slamming shut, setting the delicate instrumentation of their equipment into action and reviving the warriors.
  • The Cyberleader is assisted by an argumentative and insubordinate Cyber Deputy rather than by a Cyber-Lieutenant as seen in the televised version of the story.
  • Several mentions are made of a Galactic Congress hosting the interstellar conference on Earth.
  • The Cybermen aboard the freighter prove to be far more resilient to weapons fire than their televisual counterparts surviving numerous impacts and requiring concentrated blasts to their ventilator units to be bested in combat.
  • The Leader emits a “desperate choking sound [as] sticky black bubbles [start] frothing out of the grille,” as the gold from Adric’s badge clogs his ventilator unit during his final confrontation with The Doctor.
  • Rather than being shredded, a portion of Adric’s badge is impaled in the Cyberleader’s chest unit.


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