3. General Chang / Christopher Plummer / Star Trek VI: The Undiscovered Country
Nothing says over-the-top more than a one-eyed Klingon reciting Shakespeare. But Christopher Plummer's engaging and very entertaining performance sells it as the original Star Trek crew's final adversary. Plummer is so mesmerizing in his scenes in the Klingon court room ("Don't wait for the translation! Answers me now!") and in the climactic finale ("Cry havoc! And let slip the dogs of war!") that you wish he had more time onscreen!
2. The Borg Queen / Alice Krige / Star Trek: First Contact
The impact of the Borg Queen on the Borg -- whether positive or negative -- will be debated for years...by Star Trek fans, that is. But in the context of First Contact, she's a resounding success! Alice Krige mixes the right balance of sinister and sex to make the film franchise's first (and only to date) villainess.
1. Khan Noonien Singh / Ricardo Montalban / Star Trek II: The Wrath of Khan
Since The Wrath of Khan's release, Khan has been the gold standard to which all Star Trek villains (both TV and movie) have been held. Few have held up to the timelessness of Ricardo Montalban's chest-bearing, vengeance-seeking Khan. Seeking to avenge the death of his wife, Khan's motives are pretty simple yet it's Montalban who sells the character and gives Star Trek its ultimate baddie.