I was in the shower thinking about Battlestar Galactica the other day. The thought occupying my mind was: Who is the final Cylon? That is the big mystery this season, after all.

The writers of BSG have a huge challenge in choosing the final Cylon. They already shocked us with the season finale last year when we learned that Tigh, Chief, Torre and Sam are Cylons. Who could possibly be more shocking than that? The final Cylon can't be some character who suddenly appears this season and has a major role, just so he/she can be the final Cylon. I truly doubt it's either Pres. Roslin or Adm. Adama because that might be too over-the-top and therefore unbelievable. Of course, the writers could easily take us there over the season and make it shocking, yet believable. (These BSG writers really do rock, don't they?)

So, I thought about it. And here are the five characters who would make a shocking final Cylon:

One of the most talked about aspects of the final season of Battlestar Galactica has been who will be revealed as the final Cylon. Many will argue (and rightfully so) that this show is much more than discovering who this final Cylon is, but the fact remains that this discovery is an important aspect of the show. Otherwise, why would such a reveal be such a well-kept secret? Because it makes good TV, that's why.

With four of the final five Cylons being revealed in the third season finale, lots of speculation is flying on who that fifth Cylon might be. There are two interesting theories in particular I want to mention.