Two war-torn veterans fighting it out in their 'natural' habitat.
Both fighters are dumped on opposite sides of a large island 10 miles in diameter with no weapons, no gear of any kind, and are only afforded a single loin cloth each. They've each heard of the other's reputation and know what they're up against. Winner is determined by death, by any means neccesary. Expect plenty of traps, subterfuge, makeshift weaponry, and testosterone to spare.