Predators: Role Reversal
This might be fail, but here goes....
The 4 Predators from "Predators" and the Predators from the first two Predator movies are dropped into the Grand Canyon, on it's Westernmost side. They have all their gear: Cloaking devices, plasma cannons, wrist blades, hand held weaponry, the works. The Berserker Predator realizes where they are, and remembers that on the Easternmost side of the canyon is one of their ships, fully functional, left years ago from a failed hunt. The Predators decide to make their way to the ship.
Little do they know that they are being hunted by Riddick and Marv (Sin City.) Riddick and Marv are aware of the Predators and their history. They are also equipped with the same weaponry/gear as the Predators are. Both have Hawk bots too.
So who wins this? Do Riddick and Marv get their trophies, or do the Predators prevail?