An ordinary person from the twenty-first century, caught in today's vast, interconnected social machine, probably has no role to play except as an ordinary screw. At most, he might be screwed in a little higher or a little lower. Becoming a core component is utterly impossible.
And if he were to stumble into primitive society, he would probably have nothing more to contribute than becoming another dish for the primitives.
But what if, by some mischance, he fell into a half-feudal, half-slave society where the strong ruled? A society that had abandoned technological civilization and made the evolution of the self its ultimate spiritual pursuit.
How far could a low-ranking man, caught among the powerful, go?