What civilization/species in Star Trek is, in your opinion, most evil?

[Oddish]

The Cardassian Union was a classic evil empire. Cardassians individually were really the closest to Humans (ie, the opposite of being monolithically anything, certainly not monolithically evil) that any major Trek species has ever come.

There is no species in Trek that's harder to figure out than the Cardassians.

 

[Trogly]

My irony is intentional. The civilization that did this had no appreciation of what they were doing. They were more than careless, they were selfish. There is no justification. It was criminally negligent and not good.

Assuming the Skin's recounting is true, the people utterly failed to achieve their objective. And the assessment that they succeeded was made by the Skin, a creature that certainly had a malignant personality.

I'd compare it to the Ancients in SG1. They "ascended" and left their mess behind without a seconds thought.

 

[Oddish]

^ Armus's lot might be the most horrific of any Trek villain: he is condemned to face eternity in a hell of his own making.

 

[cooleddie74]

Armus' species (or at least his kind of sentient life form) would definitely rank at or near the top of my list of most objectively evil alien species, but the Borg can't be far behind. The Queen basically admits in FC, VOY and PIC that enslavement and assimilation of more primitive subject species is not only a good thing but should be imposed on unwilling sentient beings because, well, the Borg are badass and know better than the rest of the universe so fall in line.

 

[Kamen Rider Blade]

Armus' species (or at least his kind of sentient life form) would definitely rank at or near the top of my list of most objectively evil alien species, but the Borg can't be far behind. The Queen basically admits in FC, VOY and PIC that enslavement and assimilation of more primitive subject species is not only a good thing but should be imposed on unwilling sentient beings because, well, the Borg are badass and know better than the rest of the universe so fall in line.

That makes Alternate Future Admiral Janeway infection of the Borg Collective with the Neurolytic Pathogen even more justified.