I think plaga is inspired by aliens though? Executer movie also seems to be inspired by that but it features an unnamed virus. From my understanding, it seems to be done with executer 1st under sugimura's writing even before gaiden. I didnt watch the thing movie unlike executer though, ı dont watch many horror movies, it might be more " scary " compared to resident evil's more streamlined approach.Gaiden, BIO4 and Mold are inspired by John Carpenter's The Thing. This is an iconic sci-fi horror movie about an intracellular parasite that mimics any flesh it has absorbed/assimilated.