DuracellEnergizer said:

Star Trek II: The Wrath of Khan (1982)

I did like this movie, but only mildly; it just doesn't resonate with me the way it seems to for most other fans.

Anyway, I feel Montalban did a better job portraying Khan in "Space Seed".

Arguably, Khan has gone a little mad between Space Seed and TWOK. The planet you intended to rule over turning into a wasteland, and losing your wife to a parasitic brain eel will do that, even to a genetic superman. ;)

Spock dying was a huge deal in 1982, as there was uncertainty that Nimoy was coming back for another film. Some overreacted a tad. Starlog was even cracking jokes about fans contemplating suicide, and tongue in cheek speculation that Spock would rise on the third day in the sequel.