system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] What was Khan's original purpose? What was he supposed to fight?

So if i remember the movie correctly Khan was some kind of super soldier created and frozen 300 years before the events of the movie.

My question is why was he created? To fight against aliens? To put down rebellions?
gpt
In the Rise of Khan books (which are excellent, imho), the scientists are really just trying to create perfect human beings. Their experiments are broken up by Gary 7, and the kids are sent to live with families. 
However "superior ability breeds superior ambition" with the Augments, so they quickly made contact with each other and started a plot to take over the world.

Various alternate universe versions have the Augments being simply soldiers for the future, and apparently now the Eugenics Wars were a conflict that occurred after the Second American Civil War in the early to mid 21st century.