Favorite Two-Parter & Favorite Sci-Fi Villain

This time, you get to vote in two weekly polls! First, choose your favorite villain from the list of Big Baddies from big sci-fi franchises. Then, go back and select your favorite two-parter from the extensive lists of all the Trek series. Let your voice be heard!
UPDATE: We’d also like to know who you believe the most important real-world scientist was. Our five contenders, Leonardo Da Vinci, Stephen Hawking, Isaac Newton, Albert Einstein, and Nikola Tesla, were picked from a poll of several weeks ago. Go vote!