I agree with @Timoleth on the Dark Urge. I would try playing it but only once the obligatory murders are removed.
I'd play it like Battlestar Galactica - at some point some of the wake up and realize that they cylons but, because their enemy wiped their memory, they are different people and now side with the humans.
"It's in the fracking ship!"
Or the Nameless One who was an evil person in (one of many) a previous life but ends the game as Lawful Good. (which is the only alignment that makes since the chaotic forces are represented as idiots)
"by following the teachings of Zerthimon I have grown stronger"
