Before watching the movie:
While I know the basics of the Highlander series, I’ve never seen the television series or movies. I know the fact that there are movies plural is bad, but this is the good one.
I guess the plot is just a bad Immortal hunting a good Immortal, which as I understand it is pretty much the television show boiled down into a one-installment plot.
Sean Connery mentors the centuries-old main character, because he needs training for some reason.
It sounds like an excellent example of modern fantasy or magical realism, depending on how much the Immortals’ magic is involved.