Battlestar Galactica!

"angel?" "messiah?" i'm sticking with "pigeon."

i kinda like the idea that it's programming. the cylon society that formed on old Earth shows that cylons are as 'human' as humans are. so it may be that at some point, a society of skinjob cylons created a mechanical servitor race that evolved into humans. who knows which is the 'original' species, if there even is one. the existence of 'humans' on new Earth strongly suggests that not only has it all happened before, it may have all happened before in a completely separate cycle from the human-cylon struggle featured in the show. this would also go a long way towards explaining much of the show's 'supernatural' elements.

i think Starbuck's prophecies were fulfilled. everywhere she went, people died, and she only 'felt right' in the middle of a firefight that threatened to end the species. and she did lead them all to their end--the human and cylon races effectively ended on new Earth, combining with the indigent humans to form a genetic whole separate from either previous civilization. the Galactica and the rest of the fleet were flown into the sun, their leaders have scattered, and the remnants of the cylon fleet have been left with no way to continue as a species. Thrace ended both civilizations.

as for Rosalyn, she really didn't "live to enter the new land". i mean, yeah, she got there, but she didn't live long enough to go along with her race as it began its new existence. they arrived, they figured out a plan, and as they began to execute that plan, Rosalyn died.

i think she came back as whatever Head Six and Head Baltar are. she's 'real' but she's not real--a hallucination shared through the protocols programmed into all humans and cylons, but which has its own distinct will and existence separate from those who it touches.