The Zycronites colonized Earth eight thousand years ago, acquiring the capability to traverse different dimensions long after the timeline discussed. Upon their arrival, they introduced various plant species, such as apples, oranges, and bananas, highlighting their extraterrestrial origin. Besides flora, they also brought along animals like horses, dogs, and goats. This advanced civilization is credited with constructing Atlantis before ultimately self-destructing due to their own ingenuity.

The remnants of the Zycronites' civilization left a lasting impact on Earth, as humanity today descends from those who remained after the cataclysm. The narrative suggests a connection between their advanced knowledge and the downfall of their society, leading to the gradual evolution of modern humans from the survivors. Overall, Atwood paints a picture of a lost civilization that contributed profoundly to the planet's biological diversity and cultural legacy.