When a snow storm causes the TARDIS to crash land in the snow mountains of Northern Canada, the Doctor, Pip and Kara find themselves stuck in the snow with no means of escape and are sure to freeze to death if they don't find help, fortunately, they are rescued by Captain Walton and his crew from the FLOSD (Frost line outer space defense) The Frost Line Outer Space Defense system is a network of missile complexes stretching three thousand miles across Nothern Canada.
They are dedicated to protecting the earth against extraterrestrial threats. What they didn't count on, however, were a small group of Viking like warriors buried underneath the ice, Ice Warriors. Who take control of the system with the intention of destroying major frost line bases.General Ward, the bad-tempered frost line commander is planning to aim missiles on Mars should the Ice Warriors attack Earth, can the Doctor resolve conflict before there is a blood bath?
