Fan Casting The Flood in Neil Blomkamp's Halo

An ancient, parasitic hive-mind that infects and mutates any sentient host. It appears as scuttling Infection Forms (football-sized, bloated, explosive), Carrier Forms, and horrifically broken infected Marines and Elites. Its voice is layered, ambient, and collective—as if many mouths speak as one. It absorbs the memories and knowledge of its victims, offering "immortality" while consuming them alive.