The Seeds of Death

It is the late 21st century and mankind is totally dependent on T-Mat, a revolutionary form of instant travel. The Doctor, Jamie and Zoe arrive to find that the sinister Ice Warriors plan to invade Earth, using T-Mat to transport deadly seed pods full of a fungus that will absorb the planet’s oxygen. The Doctor must race against time to defeat the Martian invaders — or condemn the human race to suffocation...