In the 1st series episode, YOU CAN'T GO HOME AGAIN, Kara is shot down on a barren moon. The Cylon raider that had engaged her in battle - and that was ultimately her ticket off the moon, is back.
The Cylon Raiders, like the humanoid models are re-born, as, it's through that, that their battle skills increase. As (good) Sharon says;
'It takes months to turn a 'nugget' into an effective Viper pilot - and then they get killed. then you lose their experience, their knowledge, their skill sets. It's gone forever. So, if you could bring them back, and put them in a new body, wouldn't you do it? Death, then becomes a learning experience.'
She closes, by telling Kara, that because of his many previous lives, the anger Scar has - especially for Kara - grows, just as hers has.
An enemy that, you cant stop, that learns from previous experiences.
It's in this episode,that we first learn that Raiders have 'basic consciousness and survival instincts - like an animal.' There's more to the mechanised killers. There's a sentience.
It's also here, that Kara looks into (good) Sharon's face, and reflects on how there are times when she looks at her, and remembers her, as the Viper pilot who was freaking the chief.
This Sharon - the 'good' Sharon recalls them to - but, it's not 'her' memories, they're 'bad Boomer,' another Eight's she's recalling.
I point that put, because the whole story is really a hall-of-mirrors of memories.
The 'real' memories, of Kara's, the 'memories' (good) Sharon has, that are someone else's, and, the memories of Scar.
What makes the memory 'yours,' and, what is a 'real memory?
Many people who've reviewed this, weren't that crazy about this episode, as I, but, this continuing battle, that Kara has, has stayed with me, since BSG's initial run.
The reality of memory, and the enemy that doesn't stay dead - that keeps coming back, has been the backbone of many a horror film, and, to me, these are what stick in my mind.