Greg Cox wrote:
(And Timo is right; even the idea that Khan and his followers were genetically-engineered is something of a retcon. "Space Seed" only mentions selective breeding.)
Well, Kirk does mention "controlled genetics."
KIRK: I'd like those answers now. First, the purpose of your star flight.
KHAN: A new life, a chance to build a world. Other things I doubt you would understand.
KIRK: Why? Because I'm not a product of controlled genetics?