Alien: Romulus introduced The Offspring to the franchise, a terrifying new monster with its own set of powers and abilities. By the time of Alien: Romulus‘ ending, the installment solidified it as one of the best in the series. Not only did it feature plenty of classic Xenomorph-based action-horror, but it also tied to the Alien prequel movies by expanding the lore of the franchise. This was done via the inclusion of the Prometheus Fire, a pathogen that led to the creation of The Offspring.