Re: Star Trek III - The [Speculation Begins] (Spoilers)
I've got it. So, Klingons, and prelude to war with same.
Kirk and Marcus are dating. Marcus is secretly pregnant. Marcus gets captured by Klingons and is killed as a demonstration of resolve.
"You Klingon bastards you killed my unborn son!"
And then the Enterprise
And then Kirk kicks one of the Klingons off a cliff.
And we've just spoiled the third act of Star Trek III