"Hitman" and "Hitman/JLA" both offered up sequels to "Bloodlines". The first had the CIA trying to duplicate the power-giving effects of the parasites. The second, set chronologically earlier, had a separate breed of Bloodlines parasites. "Hitman/JLA" also had a scene showing the White House taking the Bloodlines parasites as so big a threat - "we can last perhaps a day with conventional forces, sir; one week after that the planet will look like Rwanda" - that they were willing to launch nuclear missiles at the Justice League to prevent the parasites from reaching Earth again.