GALACTICA

If it were Dee or Felix would anyone really care? Zarek is interesting on a ton of levels. But is he a major enough character? Baltar and Starbuck are a bit too obvious. The best choice might the Roslin. For one reason that she has minimal backstory.
 

Why do you think Cottle is out of the running as the final?
 

I was watching the episode 3x12 where the Three says 'You. Forgive me, I had no idea'. It suggests one of the final five is someone very well known to her - which hardly applies to the known four. Therefore, I'm thinking that the last Cylon is someone especially well known to Three.

The most obvious would be Adama or Roslin. A more left-field suggestion would be Bulldog, the captured pilot kept on the Cylon ship for years
 

If it were Dee or Felix, drew, the consequences could be disastrous. Either one of them could easily dismantle or disable the Dradis system. The kind of havok they could wreak on the bridge could easily destroy Galactica.

All three of the Cylons within the fleet have shown on the latest episode signs of embracing their Cylon-ness. Bad news for everyone.

My #1 bet is Lee, by the way. The hint was planted when he asked Adama what he'd do if Zakk was a Cylon.
 

What about Ellen? I have wondered if they would bring her back ever since we learned Tigh is a cylon. However, I don't know how they would bring her back - but the writers sometimes have made some interesting choices - to say it kindly.
 

I'm thinking it could be someone who recently died, such as Admiral Cain.

But Roslin's physical pain and notable wince before the power outage in the final episode of Season 3 has yet to be explained.
 

Roslin's cancer also makes sense if hers was somehow the first, and somewhat defective, Cylon cyborg model.
 

its Billy...another one will show up. Or..its Cally...she'll show up again. They cant recognize each other as cylons..yet. I hope its Cally and gives Tory a world of hurt. Question is...if these final four and the unknown cylon die..do they resurrected? And if they do..were? The Cylons would know if a stranger showed up on one their resurrection ships. So maybe its no one thats been killed yet. Trying to even guess is useless becuase any logial guess will be wrong because the show isnt logical.