You have to look at the whole thing. There are two sequels to the original Halo, then there is HALO:ODTS and Halo Wars. There are at least 5 novels, I don't kno

You have to look at the whole thing. There are two sequels to the original Halo, then there is HALO:ODTS and Halo Wars. There are at least 5 novels, I don't know how many comic books, a anime in the works and a movie that might one day be made. They have built a fascinating universe around the original game (which to be fair, on it's own doesn't make much sense, story wise ...). Think Star Wars ... What's different is that they haven't planned any of this when they made the first Halo, now they are planning all this from the get go.