Board Thread:General Discussion/@comment-3392084-20130707145759/@comment-4913740-20130708005007

Probably Outer Heaven. Portable Ops and Peace Walker have been steps along the line to seeing how Big Boss became a villain and established Outer Heaven. If the ending you suggests happens (and I would have no problem with it, it sounds pretty amazing) then it would likely be that The Phantom Pain is the very last step to seeing Big Boss establish Outer Heaven.