Dexter Season 8 Episode 7 Spoilers: Dexter and Deb Plan to Kill Hannah (TRAILER VIDEO)

Hit series Dexter is in its final season and fans can expect to see thrilling scenes in this week's episode, with Dexter and Deb planning Hannah's murder.

The preview video for Sunday night's "Dress Code" shows that the return of Hannah is taking a serious emotional toll on both Dexter and Debra. The duo starts a plan to rid themselves of her. "I want her gone," Deb says.

"The moment I asked you to kill her was the moment I started to lose myself. And I'm just starting to get back. I don't want to deal with this. I want her gone," Deb says during a 30-second excerpt.

"Dress Code" will also feature Dexter trying to teach Zach how he can control his inner monster. "One thing that you need to learn is what I had to learn, is to wait."

Zach is worried that he can't control it, but Dexter insists that he can. "You're going to get your chance Zach I promise. But the only I've survived this as long as I have it was by being careful. I am going to teach you how to do it. And then you will be able to do what I do."

In the teaser poster, Dexter is shown wrapped in plastic lying on a table, which may indicate a dark end for him, who has himself, killed countless others.

Dexter Episode 7 is set to air this Sunday, Aug. 11, and can be watched online through live stream on Showtime.