'Dexter' Season 8 Spoilers / Episode 7: "Dress Code" Premiere [TRAILER] / Hannah Returns to 'Dexter' Cast, Zach Learning the Code [VIDEO]

Dexter returns Sunday night for Episode 7 of the eighth and final season. "Dress Code" airs Sunday night at 9/8c on Showtime.

Online live stream: Watch on Showtime.com after the show airs on television

At the end of last week's Episode 6 "A Little Reflection" we saw the return on Dexter's ex-flame Hannah McKay. At the end of the episode it appeared Hannah snuck into Debra's beach house and poisoned both brother and sister.

In the trailer promo for Episode 8 "Dress Code" Dexter seems to wake up in the middle of a rocky field. Was this Hannah's doing? What does she want? Some sort of revenge for being sent to jail by the man she thought she loved?

Either way Deb wants Dexter to kill her claiming, "the moment I [Debra] asked you [Dexter] to kill her [Hannah] was the moment that I started to lose myself," adding "I [Debra] want her [Hannah] gone."

Once again Dexter is caught in the middle. On one hand he wants to respect his sister's wishes but he too is in danger of Hannah. From the trailer promo for Episode 8 it looks like Dexter will stalk and confront Hannah to try and figure out exactly what she's doing back in his life.

Dr. Vogel warns Dexter when dealing with another psychopath. Though Dexter claims Hannah isn't one, Vogel still urges Dexter to "consider all of the consequences" of taking action into his own hands.

Dexter passes Vogel's advice down to his new protégé Zach, whom Dexter is trying to teach the code.

Will Zach's urges get the best of him and force him to kill Dexter's neighbor?

Tune in for Dexter Season 8 Episode 7 "Dress" Code Sunday night at 9/8c on Showtime.

Online live stream: Watch on Showtime.com after the show airs on television