Let's talk about the final episode first. It takes all five of the final five to find Earth, correct? Assuming Adm. Adama is a cylon, then the entire final five were all present in the same room at the same time, the hangar, upon Adama's return from finding the base-ship with Rosilyn etc. And it is not long after all five are in the hangar (with Kara's Viper presumably nearby) that the four receive the second signal/song which leads to finding the beacon that leads to Earth.

In the same episode, when Adama first discovers Tigh is one of the final five, he has a complete breakdown...gets drunk, punches a mirror, semi-passes out and Lee is dragging him across the ground. And, apparently, he got that ridiculously drunk in the presumed 20 minutes it took to take Tigh down to the airlock. Adama wasn't drunk! He was having a system crash! He was caught in a logical bind.

Assuming he's the fifth, you could also assume he's programmed to work *only* with *both* humans *and* cylons, and he *must* find Earth. Only two options were available when Tigh revealed himself, 1) Kill Tigh, and not find Earth, or 2) Let Tigh go, and the Cylons destroy the humans, and they don't find Earth. Adama was booting in safe mode!

There are also clues in the 2 episodes leading up to the mid-season finale.

At the end of Episode 8, who decided to stay solo in a Raptor on a popularly dubbed "suicide mission" which just happened to connect D'Anna with the final five? And when he's leaving, he talks to Lee, and mentions one of his first duties in the fleet was a solo recon deep in enemy territory, i.e. perfect chances to be abducted and implanted with a virus.

In Episode 9, he's reading to Rosilyn in a vision of hers. He's reading a book, and the final line is "The cylon had saved my life, and I had done it no service." Sounds pretty empathetic towards Cylon kind.

Going to the mini-series that began Galactica, Adama was responsible for keeping Galactica from being networked, thereby making it the one ship in the colonial fleet to survive (ignoring Pegasus). And without Galactica, the civilian fleet would probably have been destroyed fairly quickly. And without the humans, no Earth!

And to begin the episode, Adama gives a speech which somewhat eerily predicts the destruction about to happen.

Finally, the odds are fairly staggering that three (and maybe four) of the final five cylons were all placed on the same ship which was the lone survivor. The way militaries work, what're the chances they'd all be assigned to the same ship? Well, as Admiral, he would be able to pull all the necessary strings to make sure Tirol, Tigh, and possibly Tory all ended up on the same ship.

Oh, something neat I just thought of too, going by the names they're most commonly referred to, the final five would then be Adama, Tirol, Tigh, Tory, Anders, a neat anagram.

Has anyone seriously considered the possibility of Ellen Tigh? The one common thread between the 4 revealed Cylons was their participation and involvement in escaping New Caprica. While Ellen did die by Sol's hand, she was there, and it was her undying love for Sol eventually lead to her death. Maybe Sol and Ellen are the King and Queen Cylons and all the others are their children.

Sol did say to the Chief ... " You don't want Ellen and me raising your son "

Remember D'Anna said the 5th was NOT someone in the fleet. She also apologized when she recognized the 5th Cylon. I seem to recall she had a go with Helena Cain. Therefore, my money is on Helena Cain. The other possibility is Ellen Tigh, but she was with the fleet. Even though Cain was an Admiral and commanded her own ship, she was never part of the fleet. Even though she
is believed to be dead, characters can always be brought back from the dead in Science Fiction.

It will not be any of the main characters, the Adamas, Roslyn, Starbuck, Baltar or even the Doctor or Duella (although it would be a remote possibilty, but again, both are with the fleet).

Remember D'Anna said the 5th was NOT someone in the fleet. She also apologized when she recognized the 5th cylon. I seem to

recall she had a go with Helena Cain. Therefore, my money is on Helena Cain. The other possibility is Ellen Tigh, but she was

with the fleet. Even though Cain was an Admiral and commanded her own ship, she was never part of the fleet. Even though she

is believed to be dead, characters can always be brought back from the dead in Science Fiction.

It will not be any of the main characters, the Adamas, Roslyn, Starbuck, Baltar or even the Doctor or Duella (although it

would be a remote possibilty, but again, both are with the fleet).

Remember D'Anna said the 5th was NOT someone in the fleet. She also apologized when she recognized the 5th cylon. I seem to

recall she had a go with Helena Cain. Therefore, my money is on Helena Cain. The other possibility is Ellen Tigh, but she was

with the fleet. Even though Cain was an Admiral and commanded her own ship, she was never part of the fleet. Even though she

is believed to be dead, characters can always be brought back from the dead in Science Fiction.

It will not be any of the main characters, the Adamas, Roslyn, Starbuck, Baltar or even the Doctor or Duella (although it

would be a remote possibilty, but again, both are with the fleet).

It's obviously Helo (I hope). Helo makes all the visions of the opera house make a little more sense.

Hi there! Well it is easy when you break it down. What do we know? We know for a fact that the final cylon is not in the picture. We know that most likely it will be a female (to make it the same as Greek gods, and let;s face it to just be a little fair!) We also know that Cylons and Cylons can breed, ie Tigh and Caprica Six. We also know that Caprica Six could "Feel" that the five were close at the start of season 4, but when D'Anna gets on board in "Revelations" she sayd there are now only 4. It is Cally. She had a "headache" since the nebula which was obviously a malfuntcion with her trigger. Also, Tyrol's sub conscious almost beat her to death at the end of season 2 because he could sense she was a Cylon. Also, D'Anna had her listed for execution on New Caprica, which fits with the "I had no idea,... please forgive me" line in the Temple in "Eye of Jupiter".

Leoben is the final cylon

It's the Doc. They mention him at least once an episode even when he has no involvement in the story. Once you notice, it becomes really obvious, waiting for his name to be dropped in each episode.

Starbuck's mom is the final cylon. When asked if Starbuck's "special destiny" was related to who her father is, Ron Moore replied "Her father (father in italics)? No." To me this implies Starbuck's "destiny" is related to who her mother is. Hence, Starbuck's mom, Socrata Thrace, is the final cylon, and Starbuck is the very first human-cylon hybrid. Because the final five are "different" it doesn't matter that Starbuck's mom is "dead".