Halo is pretty much recycled from nearly all the well known science fiction films like: The Thing(The Flood), Aliens(the Apone rip-off, the Drop-Ships and the similarity between the battle ships), Starship Troopers(The look of the marines) and Predator(The Elites/Arbiter). Then they just added a holographic assistant, a cyborg and a giant Halo, that can destroy the universe(oh yeah Star Wars, the Death Star, only more exagerated.).