The last intergalactic warrior fights to liberate the human race which has been deported from earth to work as slaves on an alien planet.
I'm not sure what "intergalactic warrior" is supposed to mean except that he's gotta be human -- he better be human -- if he wants to mate with a female of the homo sapiens species.
And I figured: make him the last of his kind, a dying breed of warrior being exterminated by the cabalistic aliens to decapitate resistance to their deportation.
And rescuing the girl is SOP for the "B" story, but not necessarily required in the logline which focuses on the "A" story.