Anyway, as for this season, my theory:
This woman was Dexter's childhood therapist or something along those lines. She helped Harry craft the code. As co-creator of the Code, she then passed it on to another psychopath, the season's killer, the brain guy. He is now every bit as careful and cunning as Dexter, knowing all of Harry's tricks for blending in and not getting caught, but has forsaken the moral aspects of the Code. Basically, he is the anti-Dexter. This will tie in nicely to the Deb storyline, as she will finally see what a true monster Dexter can be but isn't and at least somewhat come to terms with him.
Isn't Dexter the anti-Dexter right now? Last season he gave up on the code, he kills who he wants to kill. Plus thats a rehash of every other big bad.
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