'Dexter' star Jennifer Carpenter teases Deb and Dexter's 'dangerous' dynamic

michael-c-hall-jennifer-carpenter-dexter.jpgIt's not much of an exaggeration to say "Dexter" has virtually reinvented itself in its electrifying seventh season, which debuts Sunday, Sept. 30.

Deb's ( Jennifer Carpenter) discovery that Dexter ( Michael C. Hall) is a serial killer fundamentally changes their relationship -- in a very "dangerous" way, Carpenter tells Zap2it.

"At any second, I can say, 'enough,'" she explains. "One of us could go down at any second, and we both know it. And in fact at one point I threaten it, [saying], 'I'll take you and me down together. This is going to go my way.'"

And Carpenter relishes Deb's new power.

"I've never had the upper hand with Dexter," she says about her character, who since her promotion is her brother's boss as well. "Sometimes I feel like he tests me, like he makes assumptions about my character and how I'll behave from moment to moment."

Her relationship with viewers changed as well. "The audience has always had the upper hand because they know where Dexter is and I'm always on the dumb side," she points out, "but now I know too. So it feels like audiences are hopefully going to be wondering what I'm thinking."

Half the time, Carpenter doesn't know herself. "I truly feel like I need a voiceover this year," she laughs. "It's so cryptic to me as to where they're going. And they're giving me broad strokes, but it's hard to design anything for them or for the audience. Which is kind of like real life; I can't premeditate anything."

Regardless of where they end up, Carpenter enjoying the ride. "I've never quite felt like I've had a horse in this race," she says, "and now I really do have a thoroughbred."

"Dexter" returns to Showtime Sunday, Sept. 30, at 9 p.m. Will you be watching?
Photo/Video credit: Showtime