The Great Journey is the final level in Halo 2. Sad, yes. You are the Arbiter on this level and you fight with Elites, Grunts, and Hunters to stop Tar Tar Sauce from activating the big metal circle. After massacring monkeys, turkeys, and flies, you find a huge ass Scarab being controlled by Humans. The Scarab's eye is looking at you intensely, zooming, trying to see those large half-jaws of yours. Instead of trying to anger the humans and making the scarab kill you and your Elites, you make an alliance with them.