Since the first comic story, numerous video games, novels and other comics have been produced. The first cinematic crossover between the two species actually took place in the 1990 film Predator 2, in which a Xenomorph skull is briefly glimpsed inside a Yautja trophy cabinet, although the creatures did not formally meet on the big screen until Alien vs. Predator in 2004. A common element appearing in the AVP franchise is the creature known as the Predalien, acting as a literal crossover between the two titular species.