c'mon peeps, you know what I mean: a "bad guy" And PLEEZ, not another bad guy consumed by vengeance over a lost wife!! I hear rumors about Kahn again for ST XII. Please not.
Many, many ep's have something to overcome or danger to escape without having a "bad guy." It's just so old, cartoon-y, melodramatic. Especially with a big fight scene at the end. Gee, who will win? Snore.
Best plot involves a decision you're not sure how the character is going to resolve, and you don't really know how it's going to end.
Insurrection was halfway there; yes, I know they had a villain (scene-chewing, face-stretching F Murray frerakin' Abraham) and a half: Admiral Whooziz. BUT - I wasn't quite sure what was gonna happen to the natives (good would triumph, yes, but how), and the movie raised the ethical argument of moving the few for the good of the all, and the few won't even feel moved, so were they even moved. Since our reality is a mental construct. Unfortunately it ended with a big fight and explosion, Yeehaw. Not my cup of Earl Grey Hot, but that's me. And it prolly had a cute android with some cute tag line. But it was halfway there.
How about Operation Annihilate!!! No villain, but a planet in danger and huge decision to make along with some action and creepy - as we call them at my house with four kids - "booger bats" to boot. No mustache twirling baddie, but a great ep. Devil in the Dark. The only thiing close to a villain is really the mine manager, and he's a bureaucrat tryin' to his job. (an early Commentary on Big Governemnt, O Tea Partiers?)
I gotta go; this is too long anyway. There are many plots that don't involve beat up the bad guy at the end, is all I'm sayin. It's what I like, that's all.
Be well, and try to avoid villains today!