"I’ve always wanted to make a movie with submarines and destroyers and people torpedoing each other—a sort of case of arrested development—but I thought, ‘Oh, OK, this is about the Navy. I know how to do this. … And Khan, because I’d seen that episode ‘Space Seed,’ and I thought, ‘Oh, that guy must be pretty angry by now.'"
January 1, 1970
https://en.wikiquote.org/wiki/Star_Trek_II%3A_The_Wrath_of_Khan