In the original Star Trek TV series Sargon is a forceful, intelligent mind residing in a glowing orb. Sargon abducts Captain Kirk and plans to inhabit his body.¹
This fictional Sargon is named after two ancient Sargons who walked this Earth. Sargon I was a Akkadian king (2400 BCE) said to have built Babylon. Sargon II was an Assyrian king (around 700 BCE). Both were successful militarists.
More and more people are saying that the Star Trek franchise has created something of a modern myth. One of the ingredients for Star Trek‘s lasting success is the recasting of elements from history, myth and legend within an optimistic, socially progressive future.
Depth psychologists and cultural theorists say that the use of history in storytelling sets off a subconscious resonance, giving a story charm, fascination and, as religious studies scholars would put it, numinous allure.
The use of Sargon in this episode is a good example of calling up the past, injecting it into the present while imagining the future.
¹ Excellent outline of the story » http://memory-alpha.wikia.com/wiki/Return_to_Tomorrow_%28episode%29