The reason why you can't take a complicating plot like this more than one season is because the entire complex premise lacks validity in the real world. The reason why it its not realistic is that military black ops, nsa, cia or any covert spy operative for any intelligence wouldn't want to go through so much trouble, we've seen almost everything that can go wrong - see, if you're the 'intelligence', why would want to employ an operative part-time, thats mentally divergent, with 2 egos, 1 body etc? there is really no advantage to this type of human engineering for covert behavior . the show itself a very intense plot and i'm surprised it made it 9 shows - most plot like this are for a 2 hour movies and maybe a sequel. the cast is top notch and this show was brilliant. but it would have had to get really weird and sloppy to stretch out more than this.