More Double Trouble for the Doctor, who arrives in Australia in the near future only to discover he is the exact double of Salamander, a scientist turned politician who has perfected a technique for storing and distributing solar energy, feeding a world ravaged by storms, volcanoes and earthquakes. The Doctor meets Giles Kent, a dissident who believe Salamader is busy setting himself up as a dictator rather than the world-saving hero everyone else believes. He convinces the Doctor to impersonate Salamader in order to investigate.