I haven't read the spoilers too closely, but what exactly is it that this blood is supposed to do? I mean, obviously there has to be limitations. Like, it probably helps the little girl because she has a disease and it contains some sort of antibodies. But why would such engineering be kept from society? Clearly that would be a good thing even if the super strength and intelligence may not be. And it brings back a character from the dead from what kind of wounds? What are its limitations? It would have to have some otherwise people like McGivers never would have had to have died. It can't be just magic.