In STiD,
Sorry to wrap this whole thing in a spoiler, but it is sensitive for those who haven't seen the film.
Khan's blood is revealed to be critical to reviving Kirk after McCoy inadvertently revives a tribble (Zombie tribble??? how long had that thing been dead anyway?) Is Khan's blood unique in this respect? Could McCoy have thawed any of the other augments and used their blood instead? He actually does pull an augment out of a cryotube and puts him in a coma so that he can freeze Kirk? Was any of this necessary? I don't see why Khan's blood would be different from the other augments in it's restorative properties.
Sorry to wrap this whole thing in a spoiler, but it is sensitive for those who haven't seen the film.