Star Wars: Episode V - The Empire Strikes Back
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This time around the characters weren't two dimensional but were flushed out with personalities. Even the sets looked much cooler and much realer. The entire production was polished and taken to a more serious level.
Popularly considered the best of the original trilogy, I can't say precisely what provoked that the favor from me so many years back except perhaps my at a glance preference for the VHS covers.
You got Vader above two isolated spaceships shooting at each other, you got Yoda who's hard to look at....
We learn about the ideology present in the entire saga, about the natures of light and dark, and of good and evil.