Michael C.Hall

This season on Dexter, everything changes. And thanks to this behind-the-scenes video, we get a sneak peek at what's to come in the pivotal seventh season of the Showtime drama.

Featuring new footage and interviews with the cast, including Michael C. Hall, Jennifer Carpenter, James Remar and Desmond Harrington, this clip provides a glimpse at the way Deb's discovery turns the whole world of Miami Metro upside-down.

With Dexter's secret out and Deb monitoring him so closely, everyone's favorite serial killer is being tested in all new ways. But without access to his usual form of stress relief, does Dex finally snap under the pressure?

Dexter Video: Will Dexter kill Deb in Season 7?

In one scene, Deb appears to catch her brother attacking a man in an interrogation room; in another, Dexter ominously watches Deb sleep. Is he there to silence her for good?

Watch the clip below and share your thoughts in the comments. Dexter returns Sunday, Sept. 30 at 9/8c on Showtime.