Opinions differ, of course, but it's generally agreed that one of the high points - if not the high point - of the first "Dexter" series is Season 4 and Dexter's conflict with the Trinity Killer, played by the incomparable Jon Lithgow.

Now David Dastmalchian has been cast as the guest role of Gareth in the revival series "Dexter: Resurrection." Read More: Sitcom Star Joins 'Dexter: Resurrection' as Possible Serial Killer At this point nothing more than Dastmalchian's character's first name is known,