After you've beaten Rockwell you got back on Earth. As you sit on a hill next to a tree, you admire the sunset. However, when you look at the green obelisk something catches your eyes, then the dome from the Sanctuary disappears, leaving only the harsh reality. The overgrown Sanctuary, ruins everywhere, where a pack of armadoggos are hunting down an iguanodon and seemingly endless wasteland with strange, sick looking creatures attacking everything in their sight. And to top it off, it's suppoused to be sunset, but the sun is still shining, like it's only midday