Actually make a cinematic universe with Alien and Predator, have The Rock and some crew (maybe add Statham), be tasked to hunt down the Alien for a large sum of money, and the Alien kills off 75%-80% of his crew and he subdues it. Next movie, have The Predator come in and Rock's new team hunts him down, Predator kills everyone but Rock and Statham, the two escape and send an "tamed" Alien after him. Alien vs Predator, at the end, the Alien is freed and the two escape.