You know what they say about gifts that look too good to be true? Well the golden "Axons" arrive on Earth and offer it's greedy scientists some of their mineral "Axonite". This could provide the answer to so many of the planet's problems but the suspicious "Brigadier" (Nicholas Courtney) wants the "Doctor" (Jon Pertwee) to investigate in case this is another cunning plan by an alien race to take over mais...