Suddenly, all over the world, the precious and dangerous metal, Plutonium, is being stolen. And when a famous scientist mysteriously disappears too, it's time for UNCLE to send their tireless crimebusters, Solo and Kuryakin, to find out where - and why.

Their search takes them to the Sudan in the company of a beautiful slave girl, where they discover that THRUSH is spearheading a campaign to take over the world - with nuclear weapons!