The countdown to Dexter‘s endgame has begun.

The Showtime thriller will introduce two major recurring characters in its upcoming eighth and likely final season — and both could spell trouble for Dex and Deb.

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First up is Dr. Evelyn Vogel, a formidable and whip smart neuro-psychiatrist in her late 50s who assists the law in profiling criminals (like, perhaps, the one who murdered LaGuerta?).

The show is also on the hunt for a 40ish actor to play Jacob Elroy, a handsome and straightforward former cop who now owns his own private eye business. Our guess: Angel (or maybe Tom?) hires him to find out who killed his ex-wife.

Do you agree/disagree with our theories? Got casting suggestions? Do you think Dexter should call it quits after Season 8? Sound off below!