Original: The subsequent prequels Alien vs. Predator (2004) and Aliens vs. Predator: Requiem (2007) diverged from this theme in favor of a crossover with the Predator franchise.
Simplified: There were three sequels to this movie: Aliens (1986), Alien³ (1992), Alien: Resurrection (1997), and a cross-overs: Alien vs. Predator (2004) and Aliens vs. Predator: Requiem (2007).