Varga struck the fractured ice with his great fist. He faced his comrades bodly and barked a command at their lifeless forms: "Awake from the dead!" The world is in the grip of a second Ice Age. Despite a coordinated global effort, the glaciers still advance. But they are not the only threat to the planet. Buried deep in the ice, scientists at Brittanicus Base have discovered an ancient warrior. But this is no simple archaeological find. What they have found is the commander of a spaceship that crashed in the glacier thousands of years ago. Thawed from the ice, and knowing their home Mars is a dead world, the Ice Warriors decide to mare Earth their own... Can the Doctor and his friends overcome the warlike Martians and halt the advance of the glaciers?