 The television series Star Trek : Enterprise makes several further references to the events first described in " Space Seed " . In " Twilight " , the survivors of the Xindi attack on Earth eventually resettle on Ceti Alpha – V. The development of Khan and his followers were said to have been through selective breeding in " Space Seed " . American sociologist William Sims Bainbridge said that this method would have been unable to create genetic supermen in such a short space of time and that today the less implausible method of genetic engineering ( directly changing the DNA code ) would be used . In fact , subsequent references to the creation of Khan and the other supermen , such as in the Star Trek : Deep Space Nine episode " Doctor Bashir , I Presume " , substituted genetic engineering . 
