In the years to come they would share top billing in comic books, video games and eventually a couple of movies, to the extent that the two franchises now feel indelibly linked, even when new installments of each monster’s movie makes no mention of the other.

"Predator: Killer of Killers," on Hulu Friday, expands the franchise with animated episodes set in historical periods as Predators battle Viking, samurai and World War II warriors.