LOL. You can tell those that have played Halo and those who think they know. The storylines are totally different. Forerunners build 7 Halo rings to contain Flood. Main control center is on Earth. Forerunners were forced to use a Halo ring, hence no more Forerunners. The covenant forces are searching for the rings, they come across humans. They believe that the 3 prophets are leading them to a promised time. They (humans) stumble on Halo after The Fall Of Reach (a major Human planet) when they jumped away to any old coordinates. Thats where the first Halo starts.
Over Halo 2 the covenant start to seperate into those that distrust the prophets and those that blindly follow. At which point the arbiter realises the prophets mistake about what Halo rings are. Here you find out that Halo rings are weapons to contain the parasite Flood(actually you find this out in 1, but is ellaborated in 2.). Enter Halo 3. The fight returns to Earth. Where the Humans realise the control centre for the rings is right under there nose. It's a last stand and a fight to the death. The Brutes are now the new underlings of the last remaining prophet. Full on war.







