In season four or since season four? The Lithgow Trinity killer was the highlight of the series, IMHO. Although perhaps I remember it poorly, was Rita unusually, over-the-top annoying in that season? Oh well, it all worked out in the end. I thought Lithgow was a fascinating foil for Dex. Can't say that the seasons since then have been incredibly satisfying. I guess if you never "bought" that Litgow was the monster he was, it wouldn't have worked. For me, he well surpassed whatever remaining typecast ideas I had about him being from either 3rd Rock or Harry and the Hendersons. I thought Lithgow channeled some complex performances out of The Trinity Killer. If I ever rewatch Dexter it'll be seasons 1-2 and 4. That's it. Great point. The past is always being endlessly drawn up and reviewed in detail. I hope for Dex's sake his "mind father" evaporates when the series ends. Jesus Christ, who would want their own father's ghost following them around forever, giving them continuous advice during your day? We never see the mundane aspects of it, when Papa Morgan berates Dex for not flossing enough or undercooking his dinner.