Several palaeontologists have already been savagely attacked while conducting a research of fossilised dinosaur continues to be in an underground cave program on twenty-fifth hundred years Earth. A celebration of troopers and Teacher Kyle, the only survivor of the assault, are looking into the deaths of her colleagues when they discover the Doctor and his companions at the site of the massacre. The time-travellers are immediately suspected. In attempting to establish their innocence and find out who – or what – was in charge of the killings, the physician is confronted by an old foe… The Fifth Doctor himself, Peter Davison, reads Ian Marter’s full and unabridged novelisation, first released by Target Books in 1983, whilst Nicholas Briggs supplies the authentic voice from the Cybermen.