The headaches are caused by two spiritual freeloaders. Ungrateful, aren't they? Upon discovery, scientists force Cloud into a cryogenic sleep. :B ... Okay, it's a very /different/ Sephi-and-company-rise-from-the-dead. Deal with it.. And yes, the plot extends beyond that. Girl scout's honor.
Sound confusing? Dun worry. You'll get it eventually. Shounen-ai tags.