Jennifer Carpenter on 'Dexter'
Randy Tepper/Showtime Jennifer Carpenter on 'Dexter'

The last season of Showtime's serial killer drama "Dexter" ended with the promise of things significantly changing on a show that's become frustratingly struck in a pattern. Debra Morgan (Jennifer Carpenter), Dexter's (Michael C. Hall) adoptive sister, walked in on and witnessed our hero indulging in his side hobby. Complicating any predictions about how Deb will react is the fact that in the preceding episodes she'd come to the realization (with the help of her therapist) that she's actually in love with her adopted brother.

The season seven premiere of "Dexter" isn't until Sunday, September 30th, but the network has released the episode's title ("Are You….?") and the detail that it'll contain a flashback to Deb and Dexter's childhood. And the teaser below promises that the relationship between the two not-siblings will be a focus of the season -- thank god. In addition to the upcoming pseudo-incestuous murder dramas, Ray Stevenson, Jason Gedrick and "Chuck" star Yvonne Strahovski have all been cast in the upcoming season.