Factual error: At one point Khan threatens to target the Enterprise's life support systems which are located behind her "aft nacelle". The Enterprise doesn't have an aft nacelle; as the many exterior shots show, it has a port nacelle and a starboard nacelle. Khan a) is familiar enough with Starfleet ships to know this basic fact about the Enterprise, and b) can see its nacelles for himself on his own viewscreen while he's delivering this line. There is no "nacelle" housing the impulse engines. They are enclosed by the hull of the saucer section. (01:37:25)

Star Trek Into Darkness (2013)
Ending / spoiler
Directed by: J.J. Abrams
Starring: Benedict Cumberbatch, Simon Pegg, Chris Pine, Karl Urban, Zoe Saldana, Anton Yelchin, Alice Eve, John Cho, Zachary Quinto
Kirk sacrifices himself by going into the radiation chamber to restart the Enterprise. Khan's ship crashes in San Francisco and Spock chases after him. Bones discovers that Khan's blood has healing properties - Spock knocks out Khan and his blood is used to save Kirk. Khan is put back into cryo sleep with the rest of his men. The Enterprise embarks on a 5 year mission.
moviedragon
Bones: Jim, you're not actually going after this guy, are you?
James T. Kirk: I have no idea what I'm supposed to do, I only know what I can do.
Trivia: The library that is bombed is called the "Kelvin Memorial Archive," a reference to the destruction of the U.S.S. Kelvin seen in the first film. (00:18:05)
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Chosen answer: McCoy has no real idea how much blood he's going to need to bring Kirk back - given the catastrophic radiation damage to his body, there's every possibility that he might need multiple transfusions over a period of time, which would be much easier if Khan was still alive. Plus there's also the issue that killing Khan could well involve spilling some of the blood that McCoy so desperately needs. Bringing Khan in alive is the best way to maximise their chances.
Tailkinker ★