Earthshock Audio CD signed by Eric Saward read by Peter Davison
As the TARDIS arrives on Earth in its future, Adric argues with the Doctor about the lack of attention and respect he receives compared to Nyssa or Tegan, and wishes to return to his home planet Terradon, a feat the Doctor claims is impossible. As the group explores a series of caves, they are caught by Lieutenant Scott and his men who detected their arrival. Scott accuses the group of killing the rest of Professor Kyle's exploration team as they were searching the caves for fossils. The Doctor convinces Scott to let them help and points them to a debris of rock, where they find the bodies of Kyle's team, along with an odd metal hatch. As the Doctor examines the hatch, other men in Scott's force are killed by androids, undetectable by the humans' equipment. The Doctor is able to stop them, but the androids are able to send images back to their masters, the Cybermen, who recognize their foe. The Doctor is able to open the panel, revealing a powerful bomb that could destroy the planet, and orders Nyssa and Tegan to return everyone to the TARDIS while he and Adric deactivate it.