#3: JORDAN CHASE, A.K.A. EUGENE GREER (JONNY LEE MILLER)
Season: 5 (8 episodes)
Killer bio: A wildly successful motivational speaker and author, Chase is exactly like Tony Robbins—if, as a teenager, Robbins had talked his boys into gang raping, torturing, and murdering young blondes, then motivated them to give it their all another 13 times.
What he does to Dexter: Chase finally produces for Dexter a woman who loves him for being a sadistic homicidal monster. That woman, Lumen Pierce (Julia Stiles), happens to be the highly traumatized escaped victim who Dexter falls in love with while helping her get revenge, though, so we’re not really cosigning Chase as a matchmaker. Especially since he tries to take her away from Dexter, abducting and returning Lumen to the scene of her nightmarish torture to kill her. Cupid, he is not.