The old, of course, is Dex and Deb, still not completely resolved, and now Dex and Hannah, who in their own ways truly love each other. I always thought she was the best for Dexter, even though Deb of course thinks otherwise.
The new is Zach, bounding off of Dex's table to become his accomplice, as Dexter tries to teach him Harry's code. This something Dexter has never attempted before, and something we have never seen before, either. It's no easy job, to say the least, and not least because Dexter is no Harry, as Dexter realizes near the end of Dexter 8.7. After all, Harry was a normal person teaching a psychopath to survive in society, whereas Dexter is psychopath trying to teach a psychopath, which is very different. Though - Dexter doesn't really seem like a psychopath to me, either, to tell the truth, and that's part of the power of the show.
So it's no surprise to Dexter when it seems that Zach, angry and tired of waiting for another kill, bludgeons Cassie, Dex's attractive neighbor, to death. Dex has also already realized that since Zach already killed someone, Zach is not the same as Dex when Harry taught Dex the code. It would be nine years from that teaching, Dexter tells us, that he took his first human life.
And just as Dex is pulling close to Hannah, after he disposed of her husband killed by Hannah in self-defense, he gets called to the scene of the crime in his apartment building. But did Zach kill Cassie? That's certainly what we're supposed to think. But having not actually seen the killing, I'm not 100% sure.
This is, after, Dexter, where chilling misdirection is often the name of the game.
See also Dexter Season 8 Premiere: Mercury in Retrograde, Dexter Incandescent ... Dexter 8.2: The Gift ... Dexter 8.3: The Question and the Confession ... Dexter 8.4: The "Lab Rat" and Harry's Daughter ... Dexter 8.5: Just Like Family ... Dexter 8.6: The Protege
And see also Dexter Season 6 Sneak Preview Review ... Dexter 6.4: Two Numbers and Two Killers Equals? ... Dexter 6.5 and 6.6: Decisive Sam ... Dexter 6.7: The State of Nebraska ... Dexter 6.8: Is Gellar Really Real? .... Dexter 6.9: And Gellar Is ... ... Dexter's Take on Videogames in 6.10 ...Dexter and Debra: Dexter 6.11 ... Dexter Season 6 Finale: Through the Eyes of a Different Love
And see also Dexter Season 4: Sneak Preview Review ... The Family Man on Dexter 4.5 ...Dexter on the Couch in 4.6 ... Dexter 4.7: 'He Can't Kill Bambi' ... Dexter 4.8: Great Mistakes ...4.9: Trinity's Surprising Daughter ... 4.10: More than Trinity ... 4.11: The "Soulless, Anti-Family Schmuck" ... 4.12: Revenges and Recapitulations
And see also reviews of Season 3: Season's Happy Endings? ... Double Surprise ... Psychotic Law vs. Sociopath Science ... The Bright, Elusive Butterfly of Dexter ... The True Nature of Miguel ...Si Se Puede on Dexter ... and Dexter 3: Sneak Preview Review
See also about Season 1: First Place to Dexter