Zygon Commander Kritakh and his second Torlakh have been stranded on Earth for 20 years. Kritakh has lost his sense of purpose, can his second get him back on track? Sexy psychiatrist Lauren Anderson complicates matters further.

When Dr Lauren Anderson agrees to Thomas Mordley testing his experimental new drug Cyberon on her brain damaged patients she expects little benefit. But Cyberon is going to revolutionize medicine and maybe even the world.