Imagine due a natural catasprohe everything slowly dies over a period of months.The human existence becomes limited to a small family of one or two.What things can be done are known but how is lost.
Then slowly over a period of time humans grew again with lost and corrupted knowledge....Slowly over generation even the "What-thing-can-be-done" becomes a unreal collection of stories with strange characters and tools.Those who possesed some ancient technology claimed to know miracle just(to keep the ownership of technology).Then the Gods can into existence becuase some insited that they exist.
Slowly the humans again regained their lost knowledge to realize ancient dreams of alchemy , Space travel , Monsters , Destructive powers etc...
Isnt this story a possiblity in the evolutionary chain, atleast in some part of the world?