Nemesis agents Craig Sterling, Richard Barrett and Sharron Macready crash-land in Tibet after stealing bacteriological material from the Chinese. They are rescued by an unknown Tibetan tribe who give them special powers, which they use to escape the pursuing Chinese. Craig Stirling wakes to find himself imprisoned, and is brutally questioned but Tremayne seems unconcerned.

Craig is captured by Dr. Hallam and has a small device implanted into his ear while unconscious. When he wakes up, he hears voices in his head giving him orders. Craig is in danger so Richard and Sharron must get to him before he is killed.

Craig masquerades as a dead foreign agent. When he is revealed as a spy, he is dropped into the ocean and Richard and Sharon frantically search the Caribbean for him.

A mad scientist called Cranmore tries to recreate super-humans to equal the Nemesis trio. Sharron is tricked into the experiment and Cranmore hopes to capture Craig and Richard when they come to rescue her.

Three men find themselves in an atomic test area with a bomb due to go off at any time and if it does, it will destroy much of Australia. One of the men is Richard Barrett.

A tyrannical Central American leader establishes a nuclear missile base in Antarctica. Craig and Richard get a frosty reception when they visit.