"Dexter" revealed a secret at Comic-Con.

Showtime unleashed the first two minutes from the serial-killing drama's upcoming seventh season at a Comic-Con presentation Thursday.

The scene picked right up right where the sixth season ended, with Jennifer Carpenter's Deb discovering Michael C. Hall's Dexter standing over the body of the Doomsday Killer.

In the scene - spoiler alert! - the forensic analyst attempts to explain the awkward circumstance to his apprehensive police officer sister. She doesn't understand why the body is wrapped in plastic. The moment abruptly ends when Deb calls for backup and Dexter seemingly lunges toward her.

Does the undercover killer think his sister buys his story?

"He hopes so in that moment," said Hall, who was on hand at Thursday's panel with Carpenter.

"She's taking it one step at a time," added a coy Carpenter.

Yvonne Strahovski, who will be guest starring with Hall and Carpenter in the seventh season, was also present at the Comic-Con presentation, but she couldn't divulge much about her role. Strahovski only offered up her character's name, Hanna, and that she's a "woman of mystery with a dark past."

"She meets Dexter and helps him with an investigation into an old murder mystery," the former "Chuck" star revealed.

The seventh season of "Dexter" premieres Sept. 30.