Spock willing to give up his career, face court martial, trick his friend Kirk, hijack the ship, and possible face the death penalty to give an invalid Christopher Pike a chance at some semblence of happiness was pretty good.
Another good one was Kirk willing to sacrifice his career to get Spock back to Vulcan in Amok Time.
Of course, though many hate it the entire theme of "The Empath" is 3 friends all willing to lay down his life for the other.
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